A parent. A parent is an immediate family
Ride his bike to school, find other exercise that lets him stay inside such as pushups, situps, planks etc.
if his parents have a treadmill he can run on that instead
Long-term physical activity can help to reduce your heart rate through its response to exercise: an increased stroke volume leads to a lower stress response and therefore less cortisol is produced, allowing for a more homeostatic environment for the lymphatic system.
We might conclude that Joe is more Muscular.
If we're talking about the amount of the hits , it simply come down to technique and concentration.
But if we're talking about distance ( especially if there is a huge difference) It's very likely that it because of the difference in strength. All professional baseball player have a solid upperbody and core strength
You can party and have fun and get drunk and do drugs