The goal in weightlifting is to stress your muscles so that they get stronger to handle the stress. The key is to stress your muscles just a bit. This will encourage the muscle to get bigger without causing an injury.
Bring a notepad the next time you workout.
Start out using the machines. They might have several different manufacturers. If they do, stick to one manufacturer at the start.
The machines are the easiest to use and encourage you to be in the proper position. Read the seat adjustment instructions printed on the machine to get yourself in the proper position. Write down what the machine name is and what adjustment settings you made.
Most machines will have a weight stack in which you can use a pin to select your weight. Put the pin in the easiest weight to start with.
What you want to do is find a weight that you can do 8 times but not more than 12. Lift the weight you have selected with a slow, smooth motion. If it is really easy to get to 12, increase the weight by one increment and try again. Eventually you’ll get to a weight that is difficult to lift 12 times. Rest for 30-60 seconds and lift the weight the same number of times. Write down that weight.
So for example, say you’re doing the chest press. You start out at 20 pounds but that’s too easy. You increment the weight to 30. That’s a bit harder, but you can still easily lift it 12 times. You increment the weight to 40. Now you can only lift it 10 times. Rest, then lift it again 10 times. That would be two sets of 10 reps.
You’ll want to go through the major muscles. You’ll want to work your biceps, triceps, chest, back, abs, lower back, hamstrings, and quadriceps. Find machines which work these muscles. Repeat the above procedure to find your starting weight.
The next time you go, do two sets of the same weight, but increase the number of reps by one. So if you did 10 chest presses, do 11 next time. If you did 12 reps last time, increase the weight by one increment and do 8 reps. Like if the last time was 12 reps at 40 pounds, do 8 reps at 45 pounds this time.
Just keep repeating this process where you do 8-12 reps at a given weight. When you get to 12 reps, bump up the weight and start back at 8 reps.
The more sets you do the better the results. Two sets is about the minimum. You can do three or four sets if you feel up to it.
Be sure to give yourself one day between workouts. You must allow your muscles time to rebuild.
When starting out, don’t try to lift too much weight. Do a little less weight than you think you could handle. Then in the successive workouts, increment the number of reps by 2 instead of 1 if it’s too easy. If you lift too much at the start, you’ll get sore muscles which will prevent you from being able to go back the next time.
If you have questions about a specific machine, the gym staff will help you without getting into a personal training session.