The three types of rest intervals are ordinary, stress, and stimulating.
1. Ordinary – 3 to 5 minutes - allows for recover of your performance level prior to the next set
2. Stress – less than 3 minutes – accumulates fatigue, the more sets you do the more tired the muscle will be
3. Stimulating – 12 minutes or more – allows you to perform better on the next lift. Good for working towards new PRs.