A hamstring cramp is a sudden involuntary contraction. Stop exercising and gently stretch until the cramp eases. For recurring cramps, review training demands, conditions and health rather than automatically taking magnesium or adding Nordic curls.
What causes cramps?
Exercise-associated cramps can have several contributors. Fatigue and altered neuromuscular control matter; fluid and salt losses may contribute in certain conditions. Dehydration or magnesium deficiency does not explain every episode. Previous cramps, unusual intensity, heat and individual circumstances belong in the assessment. (Miller et al., 2022)
What should you do during a cramp?
Stop and take a stable position. Slowly straighten the knee with gentle hip flexion until you feel a mild stretch; do not force it. Maintain a comfortable stretch and consider gentle massage. Move somewhere cooler in hot conditions. Drink according to thirst and circumstances; large quantities of water or supplements are not reliable immediate treatments. (Miller et al., 2022)
REAL PRODUCT PHOTO
THE TOOL FROM THIS ARTICLE
Nordic curls without a partner or bench — that is Nordbelt.★★★★★ 4.8 on Google · 1000+ athletes
Discover Nordbelt
499.00 kr
449.00 krShipping 59.99 kr · 30-day return period
★★★★★
“A must-have for every dedicated athlete.”
How can you address recurring cramps?
Record when cramps occur and what changed in training. Adjust unusually high demands and allow recovery. Heavy sweating may justify an individual fluid and nutrition plan. Studies of Nordic training and hamstring injuries investigated injuries, not cramp prevention: they do not support a claim of 51% fewer cramps. Night cramps also need different consideration from cramping after sprinting. (Allen & Kirby, 2012)
FREE 10-WEEK TRAINING PROTOCOL
Take your Nordic curl from the first rep to
week 10.
A concrete 7-page plan: build up week by week, without pushing too fast.
01A clear week-by-week progression
02Technique and the mistakes to avoid
03A simple log you will actually use
≤51%
fewer hamstring injuries in programmes that include the Nordic Hamstring Exercise (NHE)
✓Backed by research
Van Dyk et al., 2019: meta-analysis of programmes with NHE. Not an effect test of Nordbelt or this protocol.
✓
Your protocol is ready
Open the download page again or check the email we sent you.
Frequent, unexplained or worsening cramps need review, particularly after medication changes or with numbness or weakness. Do not change medication yourself. A hot, red or swollen leg, persistent severe pain or dark urine after strenuous exercise needs prompt assessment. Confusion, collapse or severe illness in the heat is urgent. A painful muscle that does not relax may not be an ordinary cramp.
Practical next steps
If Nordic curls later fit your assessed training plan, Nordbelt can provide ankle fixation. It is a training aid, not a treatment for pain, cramp or injury. Check the anchor and use a suitable progression; the setup guide explains assembly.
Not automatically. There is no convincing general benefit for night cramps in the studied populations. A confirmed deficiency is a separate medical issue. (Sebo et al., 2014)
Can I continue exercising afterwards?
Resume gently only after the cramp resolves and normal movement returns. Stop if cramps recur or significant pain or weakness persists.
Do Nordic curls prevent cramps?
The injury studies discussed here do not establish this. Strength training can belong in a programme without being a proven cramp treatment.
THAT WAS THE KNOWLEDGE · NOW THE PRACTICE
See Nordbelt work in 12 seconds
↓★★★★★ 4.8 on Google · 1000+ athletes · 30-day return period
Nordbelt makes one of the best-researched hamstring exercises possible anywhere — without a training partner or expensive bench. At home, in the gym or on the field. Ready in under one minute.
REAL FOOTAGE · 0:12
offer−
50 kr
ANCHORDOOR · BENCH · FENCE
SETUP < 01:00
★★★★★
“A must-have for every dedicated athlete or runner.”
Jesse van Hofwegen · Trustpilot
EXPERIENCE1000+athletes already use Nordbelt
PROFESSIONAL50+physiotherapy clinics use it
GOOGLE4.8 Average rating
Up to
51%
fewer hamstring injuries in programmes that include the Nordic Hamstring Exercise (NHE)
Used by50+ physiotherapy clinics
01 THE MOVEMENT
Watch. And see why the Nordic curl works.
Movement progress
20%
Phase 01Feet secured. Lean forward slowly from the knees.
Phase 02Control the descent eccentrically — the muscle gets stronger as it lengthens.
Phase 03Catch yourself with your hands, push back and repeat.
Eccentric training — producing force while the muscle lengthens — targets the moment when the hamstrings are loaded most during sprinting. The Nordic curl trains exactly that.
02 HOW IT WORKS
Secure. Click. Curl.
Go from your sports bag to your first controlled rep in under one minute. The three videos play automatically in sequence — tap a card to replay it.
★★★★★
“It is great to be able to do this exercise by myself.”
00:04
01 — CHOOSE
Find a solid anchor point
Place Nordbelt under a sturdy door or attach it to a fitness bench, fence or beam.
00:05
02 — CLICK
Fasten and adjust to fit
Click the buckle closed and adjust the strap for a firm, comfortable position around your ankles.
00:09
03 — CURL
Start with control
Your feet are secured. Progress your Nordic Hamstring Curl training gradually and with control.
↳ Includes a practical guide and a progressive 10-week training protocol.
Place the anchor parts on the other side of the door, close it fully and check the attachment before you start.
★★★★★
“Wherever you are, training becomes easy.”
04 THE KIT
Everything for your first set.
★★★★★
“The bag and cards are a really nice touch.”
1 / 6 · tap to switch
01
Nordbelt
Adjustable Nordic Hamstring Curl tool with a sturdy buckle and soft ankle rollers.
02
Storage bag
Compact enough for home, gym or field — it weighs next to nothing.
03
Manual
Clear setup and safety guidance for all three anchor points.
04
10-week protocol
Progressive training build-up, based on sports science.
REAL UNBOXING — THIS IS HOW IT ARRIVES
Thomas PereiraDoctor, sports scientist and co-founder
05 THE STORY
Not a gadget. A frustration solved.
When I suffered a hamstring injury, I noticed how difficult it was to train properly at home without expensive equipment or help from others. That's why I developed Nordbelt.
01
Originated from real injury experience
A real training problem was the starting point — not a marketing idea.
02
Medical and sports science foundation
Further developed with physiotherapists and athletes in the field.
03
Built in Rotterdam
Practical, direct and without unnecessary complexity.
The Nordic Hamstring Exercise is one of the best-studied exercises in sports science. Nordbelt adds no magic — it simply lets you perform the exercise independently, practically and repeatedly. That is exactly the point.
01
Evidence-based exercise
Training programmes that include the Nordic Hamstring Exercise show a clear reduction in hamstring injuries.
02
Build up progressively
Start at a level that suits you and increase load and volume in a controlled way — the 10-week protocol helps you do that.
03
Widely applicable
From football and athletics to fitness and supervised rehabilitation.
Always use a stable anchor point, check every connection and follow a doctor’s or physiotherapist’s advice during injury, rehabilitation or return to play.
07 THE COMPARISON
The same exercise. A smarter route.
Comparison of Nordbelt, a Nordic bench and training with a partner
Feature
Nordbelt
449.00 kr
Nordic benchhigher purchase cost
Training partnerFree — if available
Train independently
✓
✓
✗
Fits in your sports bag
✓
✗
—
Home, gym and field
✓
✗ one fixed location
± schedule-dependent
Ready in < 1 minute
✓
± setup & space
± variable fixation
Consistent, firm fixation
✓
✓
✗
Nordbelt
VScompare with▾
NordbeltBench
Train independently✓
Fits in your sports bag✓
Home, gym and field✓
Ready in < 1 minute✓
Consistent, firm fixation✓
Nordic bench · higher purchase cost
Indicative comparison based on common Nordic benches and training with another person’s assistance.
★★★★★
“Ideal if you do not want to buy an expensive bench.”
Convinced by the smarter route? 30-day return window. See the return conditions.
08 REAL PEOPLE
What athletes and physios really think.
Google4.8★★★★★
Trustpilot4.5★★★★★
Kim van HeumenSports physiotherapist MSc. · Google★★★★★
“A great solution for performing the Nordic Hamstring Curl properly and easily. Useful in my work as a physiotherapist and in different locations.”
Jesse van HofwegenDedicated athlete · Trustpilot★★★★★
“A must-have for every dedicated athlete or runner. It is great to be able to do this specific exercise independently with Nordbelt.”
Hidde DemoedPhysiotherapy clinic · Google★★★★★
“A very useful tool for performing the Nordic Hamstring Curl. A must-have for every physiotherapy clinic.”
PaulTrustpilot★★★★★
Fast shipping and an ideal tool for Nordic curls if you don't want to buy an expensive bench. Great for strengthening your hamstrings.
Cem SelcukNordbelt user · Trustpilot★★★★★
“Very practical and sturdy. Nordbelt is easy to attach and feels stable. The training plan is clear and effective.”
Sportfysio van LieropSports physiotherapist · Trustpilot★★★★★
Excellent tool to perform the effective Nordic hamstring exercise at home, works well for recovery and is easy to carry.
John MeeuwisseNordbelt user★★★★★
“Great product, delivered quickly and very practical!”
Clear information upfront — no fine print hidden behind the buy button.
A personal question?contact@nordbelt.com
We usually respond within 1 business day.
How do I use Nordbelt? +
Choose a stable door, fitness bench, fence or beam. Close the buckle, adjust the length, check the attachment and start with controlled repetitions.
What is included in the package? +
The Nordbelt, a compact storage bag, a practical guide and a progressive 10-week training protocol.
Do I need a training partner or bench? +
No. Nordbelt is designed for independent training without a large Nordic bench. You do always need a firm, stable anchor point.
Is this suitable for recovery or rehabilitation? +
Nordbelt can support controlled hamstring strengthening. During recovery, decide on timing, load and progression together with your doctor or physiotherapist.
What does shipping cost? +
Standard shipping — Sweden: 59.99 kr. The same amount is shown again before payment.
Can I return it? +
You can request a return within 30 days of receipt. The product must be unused, clean and in its original packaging; return shipping costs are paid by the buyer.
Is Nordbelt suitable for beginners? +
Yes. Start with a smaller range of motion and support if needed, keep repetitions controlled and follow the included 10-week protocol. Stop if your technique breaks down or you feel pain.
Which anchor points are safe? +
Only use a solid door, heavy fitness bench, sturdy fence or fixed beam that cannot open, slide or tip. Before every set, pull firmly on the attachment in the same direction as the training load.
How often can I train Nordic Hamstring Curls? +
There is no single frequency that suits everyone. Use the 10-week protocol as a progressive starting point and match volume and recovery time to your level, sporting load and technique.
Where does the 51% fewer hamstring injuries claim come from? +
The 51% refers to programmes that included the Nordic Hamstring Exercise, not to Nordbelt as a product. A systematic review and meta-analysis of 8,459 athletes (van Dyk, Behan & Whiteley, Br J Sports Med, 2019) reported a reduction of up to 51%; individual results are not guaranteed.
✓
30-day return period
Try Nordbelt.
30-day return period
Returns are accepted within 30 days. The product must be unused, clean and in its original packaging; return shipping is paid by the customer.
View return policy
↩
30-day return period
Return shipping costs are paid by the buyer
