I am having a hard time finding out about recovering from a deconditioned state. Information on the web about exercise is geared either to young athletic people or to elderly people recovering from health problems. My only health concern is that my doctor says my heart is slightly enlarged but still in the "normal" range -- that is the context of my question, some concern about possible heart problems. I do not have high blood pressure, and a 3D calcium CT test showed no calcium deposits in my coronary arteries. EKG is normal.
I'm 50 and have been fairly sedentary for years and work at home. Last year I was taking short walks (20 minutes) but stopped doing that for the last few months. I write and program and pretty much just sit around. I'm overweight at 195 lbs.
I've been taking walks again, going about 2.5 mph or so, and when I first started a 5 minute walk left me quite winded. Now after 4 weeks, I'm up to 20 minutes again, somewhat winded after that, but recover in about 5 or 10 minutes.
I'm wondering if this is normal progress after 4 weeks or if I am experience an abnormal difficulty with exercise? I look at charts and they would have me walking a couple miles after 4 weeks, and I'm nowhere near doing that.