Android: Exercise accessories like the Nike+ Fuelband and the FitBit are all the rage right now, but if you don't own one, you can still use your smartphone to keep track of your workouts. Though it might not have every feature under the sun, FitNotes is a fantastic and easy to use gym companion for your Android phone.
The premise of FitNotes is simple. You choose the exercise you just completed, enter the amount of weight you lifted or the distance you traveled, and save it to your exercise log. Over time, you'll build up a collection of daily exercise regimens to help you track where you've improved or regressed over time.
FitNotes features lots of different exercises and categories, but you can also add your own if you wish. You can view your recent activity by swiping from day to day on the main screen, but the calendar view provides the best overview of your workouts. From here, you can set up milestone alerts to let you know when you've hit a custom goal for each exercise, making it even easier to detect patterns in your routine.
The app isn't particularly feature-rich, but it's perfectly designed to quickly enter data between sessions at the gym, and it checks every box you would want in a pen-and-paper exercise log. Grab it for free on Google Play before you next hit the gym.