While extrinsic muscle fiber is about strength. Intrinsic fiber is about movement.
Extrinsic muscle fiber makes us bigger and stronger...intrinsic fiber contributes to mobility and stability.
Extrinsic muscle fiber is contracting skeletal muscle fiber. Intrinsic muscle fiber is proprioceptive lengthening muscle fiber.
Injuries, over-use and muscle imbalances turn-off intrinsic muscle fiber and lead to muscle tightness.
The only way to restore the tight proprioceptive muscle fiber is to reboot intrinsic muscle with diagonal isometric force.
"I use StandingFirm® for deep glute activation with my athletes."
Josh Seligman MS, ATC, RSCC
Major League Specialist Milwaukee Brewers
"We have done exercises with our players and have seen an immediate response."
Aaron Nelson ATC, NBA ATC of the Year
Head Athletic Trainer Phoenix Suns
"We use the StandingFirm® in our pre-game and strength training routines."
Joe Kessler MS, ATC
Major League Strength and Conditioning Coach
"StandingFirm® is able to stretch and strengthen the hip area with various ranges of motion and resistance, something that is very hard to do."
Gavin MCMillian Founder Sports Science Lab
San Juan Capistrano, CA
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