I've been playing for 2 years, recreational player. i'm maybe around NTRP 4.5. since I noticed that I'm getting good to the sport, I hired a pro coach. and his coaching/lessons are SOOOO DIFFERENT from my previous coaches. especially on footwork. i'm flat and cross footed so i'm having problems with it. and my stamina runs down to 0 in just only 25-30 minutes of footwork drill, i'm having a tournament and my new coach said that i'm not ready for it yet. because it's a international tournament. so the MAIN POINT is how to increase muscular endurance/stamina and how to have lighter feeling on my footwork.