Came here to say something similar.

I'm someone who suffers from major reluctance to exercise. To be more specific - the first thirty minutes of exercise are hell, always. Doesn't matter how long I've been doing an activity. It feels like the first time. Exhaustion, fatigue whatever.

This basically means stuff like jogging is out, since it takes so long to get over the hump each time my motivation to do it can't be maintained.

Recently (in my late forties), inspired by some friends who go regularly, I've started attending a weight lifting centred gym near my house.

The cardio I do at the beginning and end of each workout is still hell. But the weight lifting itself really is quite freeing, and it's wonderful to see your strength go (gradually up). It's great also to discover my legs are much stronger than I'd have expected (after years of riding a fixie), despite my arms being flimsy noodles.