Running

how far are you getting before you give up TB? some of my runs I don't settle in until I'm about 4 miles in and then I feel 10x better than I did when I started.

This. The body takes a while to adjust to you forcing it to run. Perseverance will pay off.

Anything from 5 minutes to 5 miles. It's like my body's stopped releasing endorphins and they were the only reason running held any appeal :/

Unfortunately (apologies for oversharing) this has been happening since I switched to the contraceptive injection, so I think it might be that... And it sticks around in your body for three months so I'd better get used to running being really dull or I'm not going to get off the sofa for the next 10 weeks.