Have been using a 120g racket for everything for a while (when not playing seriously) just to get more forearm muscle and it has improved my shot quality a lot. I can play a match with someone lower level than me entirely using it so my endurance has increased too I guess haha. I recently bought the yonex tr0 - basically a 150g racket and it comes with a headcover. I've been using it a lot and notice it really helps you emphasize putting power into your entire stroke - from the backswing to the follow through. It's really good for practicing drives or defense (any short returns). Are there any drills in particular I should be using the headcover for? Should I put it on my real racket or keep it on my training one? One thing I do notice is that your timing gets adjusted switching between training and real racket but that's to be expected I guess with the literal 80g difference lol.