This is an excellent exercise to promote a stable core by applying movement through either the legs or arms and legs together. The combined movement occurs at the hips and shoulders while the low back remains stable, allowing this exercise to have excellent carry over to your daily movements.
You can also ‘sweep’ your arm and knee back underneath your body so no weight is borne by either, in between each repetition. Don’t let your back round during this motion but instead maintain the neutral spine position and allow the motion to only occur from the hips and shoulders! Again, perform the same descending rep-scheme as the previous two exercises.
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