Re: Strength +10
If you just want to do it at home then buy a set of dumbels, you can train your chest, biceps, triceps, lowerarms, shoulders with them. Push ups aren't bad either but you can go far with a decent set of dumbels and exercises if you insist on avoiding a gym.
About doing a specific musclegroup every other day; That would be ok to gain a base strenght and fitness, when you start to get a decent amount of fitness you should do it once or maybe twice a week but with utter intensity for maximum strenght gainage. 9 to 12 sets a week is considered effective but you can experiment with this a bit as not every body reacts the same way.
In my opinion.
On a side note. When I started training 10 months ago, my weakest part was my chest. Because I like to have a brutal chest I concentrated a lot on this part and it's now my strongest part by far, I am just trying to tell you that you can get strong arms quite quickly if you show a bit of willstrenght. Within 3 months effective training with dumbels you'll notice a huge difference.
Edit:
Arm strenght doesn't really determine how far you can throw a ball, I recently read an article about some kind of test on a sport education school. A certain class did two contests. First they started a benchpress contest. The next day they did a contest consisting of throwing a ball as far away as possible. The guy who won the benchpress test (by far mind you, he's a bodybuilder) ended last in the ball throwing contest.
Benchpressing isn't mainly ment to train your arms I know, but someone who wins a benchpressing match doesn't have weak arms.
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