When I'm lifting weights, doing push-ups, or working on lunges, I tend to lose track of my repetitions. You too? Then try counting out loud next time. Not only will it help you remember how many you've completed (and how many you have left), but it's incredibly motivational. I feel like my own cheering squad. It also helps me remember to inhale between each repetition (instead of unintentionally holding my breath). I count loudly if I'm at home, but if I'm at the gym, then I just whisper. Try either counting forward (1, 2, 3 . . . ) or backward (15, 14, 13 . . . ). Experiment with both ways to see which you like best.