If the mind over body thing doesn’t work, try very very gradually increasing intensity without regards to time. When I’m feeling really awful, I’ll slow jog/wal

If the mind over body thing doesn’t work, try very very gradually increasing intensity without regards to time. When I’m feeling really awful, I’ll slow jog/walk less than a mile on the treadmill first thing in the morning, then come back later to do a proper run. It’s like taking all day to warm up, and it usually works if I can muster the will.