MyFitnessPal is one of the best general fitness logging apps on the iPhone. Not only can you log workouts but food and water intake as well. What's more, it connects to hardware like Fitbit and Jawbone UP, and is available on most mobile platforms. Check out the video above for my full review!
If you haven't tried it yet, download it now and get going! If you have, tell us how you like it and how you're using it!