I must confess my jackknives are pretty pathetic, but as I've continued I've gotten more stable on the ball & they feel a bit better. When I start getting tired I feel a bit of strain in my lower back.
I'm trying to work on that by doing supermans & making sure my lower back is well warmed up before exercising.
You might try keeping the ball further up your legs & gradually moving out closer to your feet as you grow stronger.
You're smart, listening to your body!
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