Single-leg sled pushes and pulls involve emphasizing one leg to move the sled on each step, which is especially good if you're trying to focus on a weaker side.
An easy way to implement these single-leg sled push and pull variations is to simply perform half the distance or duration with one leg and do the second half with the other leg.
Screw the rotator cuff! That's right, screw it. When it comes to fixing shoulder pain, the the rotator cuff is over-hyped and gets way too much attention.
This spine-friendly variation of the stir-the-pot exercise (normally done on a stability ball) fires up those deep core muscles often missed by most ab exercises.