Re: How soon after heart attack can I excercise?
I was 5 days in ICU for congested heart failure (I had had prior MI) and a stent implant. The release instructions stated no heavy lifting, so 5 days was ample for me. I had a lot of energy so it may depend on the individual and how they feel.
Walking is a very good exercise for the heart (at least 20 minutes, 3 times a week) don't exceed a target heart (220 minus your age is good target). For skeletal muscles, stretching and light resistance won't cause any problem. It has been about 3 years and the regimen has served me well.
If you need to lose body weight, and from your post you don't, then there is no need to increase distance walked. Focus on heart rate and increase gradually to a target rate with an increase in pace.