Both can coordinate the whole body muscle movement.

Running consumes a lot of energy. While exercising your legs, you can also get rid of the fat on your stomach and highlight your abdominal muscles. Of course, the most important thing is to exercise your endurance.

Sit-ups can improve waist strength and strengthen abdominal muscles.

The best way to practice arm muscles is push-ups. According to my personal experience, it is best to take 20 times as a group and rest for about 30 seconds before doing the next group. If you do it many times at a time, you will basically die in the back. Relatively speaking, my method will be more efficient. Exercise often stops until the muscles are sore. That's because strenuous exercise kills muscle cells, and then grows new cells again, making you stronger.

If you just want to exercise your muscles, spend half an hour doing push-ups and sit-ups before going to bed at night.

I did a lot, but I hurt all over the next day.

But I don't recommend this practice. It's too heavy for your health, so it's better to take your time.

Of course, it depends mainly on your own wishes.