The SA sled March Series. The absolute staple to our famous “Trunk and Spine” preparation systems. It’s crucial to develop isometric trunk rotation simultaneous to concentric hip extension (acceleration); and isometric trunk rotation simultaneous to concentric knee extension in deep bending positions (deceleration).
The great thing about these sequences is that it also works on strength endurance; as well as loaded versions of support system prep.
Phenomenal prep sequence before advanced speed development. The necessary function of all pain management protocols. One of the most important functions of all grade school and middle school athletes. I would put a priority on this over ANY “warm-up” for young athlete (hint – use bands and partners at this age! You don’t even need sleds).
Also, note the dozens of variations and loading patterns.
Learn physics. Understand force. Know the direction of force and how it changes the intention. COACH INTENTION, NOT exercise form. Assign appropriate loading progressions.
The great thing about applying mathematics to exercise is there is no “guess work”. There actually is concrete answers of right (appropriate) and wrong (inappropriate).