The book says,
Playing a game of tennis is a great way to get a workout. Warm up your muscles first and take care to use proper hitting and serving techniques to prevent injuries. Tennis pros say that a couple of days each week on the court should be enough for a good workout.
Days off the court allow your overused muscles to rest and recover. Almost anyone, from eight- to ten-year-old children to seniors in their seventies or eighties, can play tennis. Learn how to play now and you can enjoy it for a lifetime.
Plus, tennis is one of those games where you need another player. If you are playing doubles, you'll need three other players; it's a good way to meet new people, get a workout, and feel great.
It has been a long time now, but we used to go hit some tennis balls. We of course only played for fun.
Just For Today: Hitting some tennis balls may be a way of releasing some stress too.
From the book: Live Happy