I tried everything - lifting weights is the only thing that 'stuck'. I'd love to swim, but the only pool is at the gym and it's heavily chlorinated and I have to shower before and after swimming which is now outside of "convenient to exercise".

The gym is a few minutes up the road, I'd jog but it's on an incline - terrible for the knees.

Scan in, get changed, throw some weight around, wipe off the sweat (not enough time for a full shower), leave. It's convenient enough and something I've managed to stick with long-term.

I agree.. I have had a greenway near me for 5 years before I started using it... If you can do something without even having to commute to it, it can be even easier to start a habit