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1. Keep the tension when performing a rep. Go until failure then start again.
2. Train different muscles/body parts more than once per week.
3. Eat more protein - try to get 50 - 80 grams per day (ready-made protein shakes and whey protein powder is good).
4. Choose a weight that's just right (the right weight should make it hard to perform reps 8-9, and very hard to perform reps 10-12).
5. Increase the intensity, frequency and volume of each set.
6. Include dead lifts and squats in your workout to increase testosterone (testosterone builds muscle).
7. Have a good sleeping pattern and good sleeping habits.
8. When working out, drink lots of water, have a drink between each set.