Basically I started a group lesson from 4-6pm every Tues, Wed, and Thurs for the month of July. I usually go play badminton on thursdays, sometimes friday and saturday. Today was the first session and I come home dead tired because we did 30 minutes of footwork in the end after we had our games. I've decided to lay off badminton on thursday and go play on friday and saturday. Each time I play is about a 2 hour duration. I talked to my friend and he said that if I try really hard during these lessons three days in a row, I can tear ligaments and cause damage. My question is playing 10 hours of badminton a week too much or it might be too tiring on body? (I'm turning 17 and I have summer school during the day XD) And any useful tips to prevent injuries from playing badminton often? Resting strategies? Any advice would greatly be appreciated!!! Thanks!