“People often fall into the trap of hitting the treadmill for 30 minutes every time they work out,” says Rachel Cosgrove, owner of Results Fitness in Santa Clarita,...

I have a love affair with my gym. She’s not much to look at: a rubber track and weight room in a dank basement, but appearances aren’t everything.

what time is it? If you can glance down at your wristwatch and figure it out in, oh say, less than two seconds, it may just be too easy for you. And that’s a wasted...