Whip side to side and torch your shoulders.
Stay low and let your hips and core drive the whip, not just your arms.
Whipping the ropes side to side instead of up and down changes the plane of the work, so your hips and torso have to rotate and brake the load while the shoulders steer it. It still trains conditioning first, spiking your heart rate through continuous explosive effort with no impact. It earns a spot when standard waves get stale and you want your engine tested in a different direction.
Regular waves travel up and down, lateral whips sweep both arms side to side so the power has to come from your hips and trunk rotating. Same conditioning hit, different movement pattern and a fresh coordination challenge.
Swinging both rope ends as one unit forces your whole torso to drive the movement rather than the arms alternating. It also keeps the waves clean, if the ropes lose their rhythm your power source has switched to arms only.
In a soft athletic stance with bent knees, low enough that your hips can drive the swing. Standing tall turns it into an arm exercise and kills both the power and the conditioning effect.
