Straight-legged twist (Marichyasana)
This “puts great pressure” on the sit bones and pelvis, as well as “great but safe pressure” on the spine.
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Bent-leg twist (Matsyendrasana)
The bent-leg twist “puts great pressure” on the upper femur and pelvis, plus “great but safe pressure” on the vertebra.
Dr Fishman suggests you should hug the leg to ensure a straight spine.