As mentioned and redescribed, big toe flexion and the ability to prohibit a collapsed foot arch without knee valgus fault (calving in) or lack of big toe strength, (ankle rolling out), has more to do with pain than any health or medical professional understands. When the toes and ankles lack flexion and dorsiflexion, the hip cannot properly internal rotate, which means your butt muscles will not work. Considering they are some of the largest, strongest muscles, this then becomes a problem of duck walking, out toed movement that constantly makes the body try to compensate for poor walking gait and running mechanics. From youth to Dad bod to elite athlete’s, its a problem that is not addressed actively in the fitness community. More often, back and hip pain is not coming from the back, it is coming from your janky feet. Try 5 reps for 3 sets on each ankle.