why are you supposed to get your heart rate up to lose weight? can you lose weight doing low intensity workouts like walking?

You can't count walking as working out, you should try jogging.

as your heart speeds up, your metabolism temporarily speeds up as well! although you do burn fat while walking, it isn't as effective as running, swimming or cycling!
answer mine? http://answers.yahoo.com/question/index_ylt=Aq9HiNE8Go8X_EPqd_fbkgHsy6IX_ylv=3?qid=20120204053214AALmI8R
Cheers,
Ach

You can, but you'd have to walk for over an hour to burn like what 100 calories? That's not even a meal. I burn 100 calories on the elliptical in 10 minutes!! It's your call.