For anyone who hasn't tried one of these, my absolute favorite tool for my healthy lifestyle is my pink Polar heartrate monitor. It costs $100. It's a chest strap and a watch. You plug in your weight, date of birth, gender, and height. It logs your workout time and calories burned. It also shows the amount of time you spent in certain heartrate zones. There are other programs it performs, but those are the ones that I use. I've set my goal to 3,500 calories burned working out per week.

If you're shopping for a heartrate monitor, don't go for the one that you have to hold your thumb to in order to get a reading. The chest strap is the most accurate reading you'll get. It seems like it might be cumbersome at first, but you don't even realize it's there once it's on.