They really are very difficult. I can't tell you how many times I've lost my balance and rolled backwards while doing them....the biggest challenge for me was trying not to shift my bodyweight onto my knees. If I do that, it hurts my quads while coming out of the hole and unless I take like 10 minute break, my workout is done. The pain is unbearable.
Good luck progressing on Pistol Squats, Cradler. If you need any help, hit me up.
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