I'm trying to keep breast cancer away. I've had it once, and I really don't want it again. So I am committing myself to all strategies for keeping the disease out of my life -- like eating right, maintaining a normal weight, not drinking, not smoking, and as of yesterday, exercising strenuously.

New research shows strenuous exercise is what it takes to minimize the risk of breast cancer. Not moderate. Strenuous.

OK, I'm on board.

Now I've been a student of moderate fitness for most of my life. But now I'm embracing this new approach, this new way of pushing my body to its near limits. I figure if my choice is cancer or strenuous exercise, I better take the route that will leave me sweating and huffing and puffing, not sick and weak and bald. And so yesterday I took my first stab at what I will try to do at least five hours per week -- what experts say it takes to make a difference.

It all started with a warm-up lap on my treadmill -- just one lap at 4.5 miles per hour. Then I upped my speed to 5.3 and ran for a mile and a half. I continued running for another half mile at 6 miles per hour and then began walking again. I started at incline 1 for one minute, then moved to incline 2 for one minute, then incline 3 for one minute, and so on until I reached incline 10. My goal was to then continue walking while decreasing the incline each minute for ten minutes -- but I was so out of breath and fatigued, I jumped the incline down to 4 for one minute, then did 3 for one minute, 2 for one minute, 1 for one minute, and then I stopped. The whole process took about 40 minutes and left me soaked with sweat and gasping for air. Then, just in case my workout wasn't strenuous enough, I did 20 push-ups, a handful of sit-ups, and a few other floor exercises before heading to the shower.

So that's my version of strenuous. Now, I don't plan to do this same exact routine for all five hours I must complete each week, but I do intend to sweat and huff and puff just as much as I did yesterday. Because if strenuous is what it takes to ward off evil cancer cells, then I'm game.