That’s understandable and static exercise in a gym bores me to tears. I’ve learnt in this forum how different T1 and T2 can be. But as regards exercise I built up my walking very slowly. I’ve been unable to avail myself of the cardiac rehab unit as it’s closed, so I am committed to regular walking. I now regularly do six miles a day - I’m up to 58 consecutive days.
The game changer for me is a smart phone and earphones. Whilst walking I listen to music and to podcasts depending on my mood. Music-wise my mood can be set by classical, ‘pop’, metal etc and with podcasts whatever I want to explore - politics, rugby, cricket etc.
The great thing about walking is you set your own pace and can vary it according to how you’re feeling - mental and physical.