If you're not careful you can sit on your boom boom all day and play with your droid. Here's some apps to help you get in shape and play with your super phone simultaneously.
Calorie counter app (free) Excellent food diary- limited workout/ exercise log- limited weightloss tracking
Calorie Counter review - Android Health & Fitness Apps - Know Your Cell
Gym Technik (paid subscription) Perfect workout log/ weight loss tracking/ graphing