Push ups are the best exercise for throwing strength. Basic dumbbell exercises, like shoulder raises and side shoulder raises, are great as well. Just stick with lighter weights; you don't really want to bulk up for throwing strength.
The simplest ones are a dumbbell row, suspension training, and proper push-ups. If you're strong enough, you can also do chin-ups, but don't push it if you're not ready, because...
Schedule plenty of games to play! If you're concerned about social distancing, games like charades are a great option. You might also enjoy "Heads Up," which is a party game...
In general, squats and deadlifts. Some people say those are too old school, but compound exercises are going to overload your body in the best way. When you're working on...
Work on accuracy first. Start slow and accurate, then, over the course of weeks and months, gradually throw harder and harder. This takes time; you will not see results in...