One of the best ways to track your weight lifting progress session-to-session is to keep a journal of your weights and reps and the order of your workout. This allows you to see progress over time, and lets you know what weight you should be attempting at your next session, so that you’re always pushing yourself to do heavier weight.
For the longest time (and when I was my strongest/biggest) I kept a log in a little spiral notebook, but found that I was always forgetting a pen, and writing down the exercises and the reps/weight just became too much of a hassle and I stopped using it. My buddy Mike showed me an iPhone app that he’s been using that I decided to buy called Gym Buddy. It took me 20 minutes to setup the application the exact way I wanted it, but that’s what makes this app great. You can set categories like “chest/bicep day” and then select all of the workouts you do in that session (you can make your own if they don’t already have it listed). While you’re working that session then, it’s just a matter of tapping on the exercise, entering the weight and reps, and you’re done. The app also has cool features like multiple timers, that you can start so you are always resting the same amount of time between sets, and it can also calculate what your 1-rep-max should be for that workout based on the data of your last set.
The app is $2.99 and available in the App Store on your phone or through iTunes.