Traditional machine leg curls are a waste of time for athletes.
I prefer Valslide or slideboard leg curls over a lying or seated leg curl machine for building the hamstrings any day.
Read more about the Valslide leg curl - including progressions and regressions - in my new article on STACK:
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Yunus Barisik, CSCS, is the Head Strength and Conditioning Coach for an elite junior hockey organization based in Espoo, Finland. He has trained hundreds of hockey players at the junior, college and pro levels, including NHL Draft picks and World Champions. An accomplished author, Yunus has had articles published on top fitness and performance sites, including STACK and Muscle & Strength. He also wrote Next Level Hockey Training, a comprehensive resource for ice hockey players on building athletic strength, size and power, while staying injury-free.