I've always walked lot's-kept it up for reasonable time after dog died, but it trailed off without him to motivate me. Other issues, have then led to a few months of complete inactivity, other than pilates once a week. During this time of inactivity, I have had blessed relief from painful /stiff hips. But it's just not me. Apart from swimming, what else will get me fit, whilst avoiding a return to previous pain levels?