Summary
The video discusses certain muscle groups that are easy to contract without any load, such as the lats. It explains that activating the lats can be difficult and requires practice over a period of months or years. Genetics and early development through sports and activities can influence the ease or difficulty of muscle activation. For hypertrophy, it is recommended to perform 10 to 20 working sets per week. If adaptations are not observed, adjustments to the style and amount of repetitions per set, as well as considering factors like intensity, sleep, and nutrition, may be necessary.