When lifting your own body weight, dumbbells, or another muscle strengthening tool, full repetitions feel great. If you're looking to maximize your time and increase your strength though, give this a try. Instead of raising and lowering a weight (or your body weight) in one continuous motion, pause halfway in the middle of your repetitions. Pause halfway up, and then halfway down. It will actually save you time in your strength training sessions because it's an effective way to exhaust your muscles since you're not using momentum, so you'll end up needing to do less reps.