To get the best quality curls or shoulder presses, only exercise one arm at a time. Do one set with your right arm, then follow it up with an identical set with your left. By separating the two, you are more likely to see quality results than by doing the sets simultaneously.
When you are performing leg presses, push off with your toes instead of your whole feet. You will be working your legs much harder than usual, and results will appear much quicker. Using your toes exercises muscles that usually do not see too much action, so they are quicker to react than others.
Test your maximum to make it seem easier. Take a few seconds to lift a weight you know you cannot handle yet. When you lift it, have a spotter, and set it down immediately. Afterwards, work out using the weight you had originally planned on, and it will feel much less cumbersome!
To build your arms, make sure that you focus on slow-lifting lighter weights at higher numbers of repetitions. This will allow your body to become toned, which you use to your advantage when your workouts intensify. After a few weeks, increase the weight that you lift.