Stand straight with feet spaced hip width.
Step back diagonally and bent the front leg to 90 degrees.
Press up from the front leg back to the start position and repeat.
Front knee bending out of line with foot.
Too small or large of a step.
Hips caving in.
Stand feet spaced shoulder width facing a box.
Jump up and land evenly onto the box.
Slowly step down and repeat.
Landing heels first.
Rushing repetitions.
Landing one foot before the other.