I try to put in that amount of walking/running time, most days. Three - four miles.
Do you have access to a pool, to do exercises, even walking in the pool (with floats)?
I’m sorry you’re having to deal with back issues. Hubby’s been seeing an acupuncturist, for his. It’s helping!!
Agree ... walking is so good for the lungs/heart. Keep up the good work, on that goal. You’ll get there, before you know it. 💞
No pool around plus can’t handle chlorine. If there was a good acupuncturist around, I’d go. closest good one is 40 miles. You are active! must be younger than me. :-)