Open up your quads and hip flexors preride with butt kicks. You can do this one standing in place or on the move. Jump up and down on alternate feet, bending one knee at a time and kicking the foot of that leg back toward the glute on the same side. Try to get your foot as close to your buttock as you can for the maximum stretch, recommends Stephanie Duryea, C.P.T. Keep your torso upright and your pelvis tucked just slightly. Don’t jump too hard or too high -- it’s the kick part of this exercise that’s most important to open up the fronts of the legs. Continue kicking for 30 seconds to 1 minute.