[davros]

Great advice. The goal I set myself is consistency of doing any exercise, this builds, eventually, habits and over time you can gradually increase the quality/amount/whatever.

There is a huge variation in people's physical capacity as well as 'motivation' - find out what works for your body by trying different things and finding out what you can do consistently. Consistency as a focus helps avoid a big limiter which is injury, which often comes from doing too much too soon. Be prepared that this process might take a long time.