Forearms
The wrist flexor and extensor muscles controlling grip strength and wrist stability. The silent performance limiter in HYROX® — when grip fails on Farmers Carry or Sled Pull, the station stalls regardless of how strong everything else is.
Anatomy and function
The forearm contains multiple muscles that flex and extend the wrist and fingers and rotate the forearm. Grip tasks also involve hand muscles and depend on wrist position, implement shape, friction and task duration; “the forearms” are not one muscle or one capacity.
ACSM resistance-training position stand · Pull-up biomechanics study
Training and interpretation
Carries, hangs, wrist movements and pulling exercises load different functions. Choose exercise, load and volume for the required task and progress from the person’s response. Forearm size does not equal grip endurance, and no exercise guarantees elbow or wrist injury prevention or HYROX® performance.
ACSM resistance-training position stand · Pull-up biomechanics study
FAQ
Is there one correct load or dose?
No. Select it from the goal, equipment, experience and response.
ACSM resistance-training position stand · Pull-up biomechanics study
Does it guarantee HYROX® performance?
No. Training relevance does not establish individual race transfer.
ACSM resistance-training position stand · Pull-up biomechanics study
What if it hurts?
Stop for sharp, persistent or worsening pain and seek qualified assessment.
ACSM resistance-training position stand · Pull-up biomechanics study
Your forearms don't train themselves - and generic gym programs rarely target them for the endurance HYROX® demands. Your race data shows which muscle groups hold you back; Repz turns that into targeted station training. Find Your Weak Station →
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