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PAWTPIE

Sit-ups I hear is hard on the back, I don't think people like these now a days.

Leg extensions as apposed to squats for quads I've heard about being bad for knees as well.

carliexo
anything with running, jumping, twisting, forced stretching, can be hard on the joints, especially with arthritis

swimming is a good exercise to do if you have joint issues!

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