I saw a doctor last fall before I took up TaeKwonDo again. I didn't do the tread mill test. I wouldn't mind working up to riding my bike to work, but my job is 24 miles away. I think it would take me about 2 hours or more to get to work. Maybe some day I'll be able to do that, but I don't have the stamina at this point.

I've been thinking about getting a good stationary bike to ride while I watch TV.

I did run across something on a running web site that looks like I could adapt it to cycling.

Pace per mile Ratio of running to walking
19-20 min/mi Run 15-30 sec/walk 60-90 sec
18 min/mi Run 30 sec/walk 60 sec
17 min/mi Run 1 min/walk 2 min (or 30 sec/60 sec)
16 min/mi Run 1 min/walk 1-2 min
15 min/mi Run 1 min/walk 1 min (or 30 sec/30 sec)
14 min/mi Run 1-2 min/walk 1 min
13 min/mi Run 2 min/walk 1 min
12 min/mi Run 2 min/walk 1 min
11 min/mi Run 3-4 min/walk 1 min
10 min/mi Run 3-5 min/walk 1 min
9 min/mi Run 5-7 min/walk 1 min

I could start off slow and do maybe 5 miles in 30 minutes, and break that up a little with a few hard peddles and easy turns, which will be easy because of the hills...
Then after a week or two, try to go 6 miles, and slowly work up to 10 miles. Then work on increasing my times. Still alternating between hard and easy peddling.

I should also see about doing a tread mill test just to be on the safe side.

Thanks!
Don