hard time getting motivated

ive had the duster up on jackstands for 3 weeks to pull tailshaft for a new bushing.at 54 im not to excited about rolling around on concrete,with two bad knees and a hip giving me problems,30 years of hvac has taken a toll on my body,anyone one else having a hard time getting motivated? i wish i would have put in a lift 25 years ago when i built my garage

It's never to late to install a hoist!

Yes I agree about laying on concrete working, it's not as fun as it use to be. At 56 I dread getting under there, but once I get under there and get going I just keep going until I'm done.