Is it effective to go to the gym to keep fit and shape? (I'm a man)
It will be effective, but it also depends on your physical fitness. The key is perseverance. Muscle building is not achieved overnight, but accumulated bit by bit for a long time. The key is persistence and rationality. Don't exercise too much. Don't fish for three days and dry the net for two days. Make a reasonable fitness plan for yourself. You can basically see the effect in half a year. Wish you success!