Badminton – this is a game I find being really relaxing… but with the right ‘tools’.
Some low-quality racquets might blow the fun out of it, but the good news is that decent racquets can be found easily in the 20$ range… the fun you have playing with them: invaluable.
Just got a Badminton Basic Kit from Head (cheers to Dia_Fantasy for recommending these to me)… and I played with them until I could hardly see the shuttles in the night 
Bottom line: Go out and play !