- Stand with one foot forward and other foot back with knees
initially bent only slightly. Dip body down by bending legs more.
- Immediately jump upward. Quickly reposition legs and land
with feet in opposite positions. Immediately dip body down by
bending legs just short of rear knee making contact with floor.
Keep torso upright and hip of rear leg straight. Repeat sequence
with opposite leg movement. Continue jumps by while alternating
hip flexors are required so hip of rear leg can extend back
without pulling upper body forward.