So here are some plank modifications/regressions if a full or elbow plank isn't accessible to you:
— liberated tortoise (@saltatorybund) August 21, 2020
1. Plank on knees, lower legs lifted
2. Plank on knees, lower legs on the mat
3. Modified side plank
4. Tabletop
All modifications can be taken on the arms or on the elbows. pic.twitter.com/6ccVvABO91