When it comes to rest days, there is no one-size-fits-all answer. How many rest days you need depends on a variety of individual factors such as your age, fitness level, and type of activity. Generally speaking, for those who are relatively young and healthy, most experts recommend taking one to two rest days a week.
If you are just starting out with a new exercise routine, it is best to start slowly and build up gradually. You should give your body time to adjust to the new activity, and taking more rest days in the beginning is a good way to do that. As your body gets used to the new routine, you can start to reduce the number of rest days.
However, if you are an experienced athlete, you may need more rest days to prevent overtraining and injury. For example, if you are training for a marathon or other endurance event, you may benefit from taking several rest days each week to allow your body to recover.
In general, the best way to figure out how many rest days you need is to listen to your body. If you are feeling tired or sore, it is probably a good time to take a rest day. However, if you are feeling energized and ready for more, then take advantage of that and push yourself. Everyone is different, so experiment with different amounts of rest days and see what works best for you.