Your body really does need all three components to stay healthy and strong. No matter what you're doing for exercise, your muscles adjust quickly to any repeated activity. So just as running five miles a day gets easier over time, slow training will start to feel like a breeze if done repeatedly. Whatever gains you make will start to dwindle. Believe me when I say that after a few weeks, slow training becomes deathly boring.
Slow training is fine every once in awhile.
But in general you should follow a balanced program with lots of variety to keep your body progressing. Ask Michelle . Michelle Gagnon is a personal trainer based in San Francisco and the author of the Daily Training programs for The Lazy Girl's Guide to Getting Fit in 6 Silly Weeks . For more of her columns, check out the links below. How exercise fights PMS, stiff muscles and cottage cheese thighs.