I second the HRM idea. Since I got mine I couldn't be happier. It took the guesswork out *and* its a great way to kep you from phoning it in ( I first thought about one when I realized I'd not been putting my all into insanity for a couple days and was thinking if I should cut the time when putting it into the tracker, or if maybe I should redo the week before moving on... even had a phase where I took about 10 min off and added a second entry for stretching because I thought the calorie difference was significant and I didn't want to over estimate).
When I mixed exercises it was also a godsend. For the time I was going to the gym, I liked jumping on the treadmill for a couple min (to get HR up) between sets on the machines, and this way I didn't even think about keeping track of how long, etc. Just went.
Highly recommended (but be sure to get the one with a chest strap!), now I just put the time and calories straight from the watch and don't have to think on editing anything or how to name the exercise (specially if I did a mix of stuff).
| current weight: 153.0