@dr.lisa.dpt: Think of internal rotation as force production- the bottom of a squat, the bottom of a deadlift and midstance of gait. This is where your body develops power before exploding off the ground. Having flat feet as a runner can be a good thing because it now means you can access this internal rotation faster since your arch is closer to the ground #runningtips #marathontraining #runtok #speedrun #trackworkout