Now observe your hand.
If the hand moves in the same direction as the racket, then no matter how loose the grip, the arm is still too controlled.
If you then allow a small space between the hand and the racket, as though the hand is gripping a larger handle and repeat the wave of the racket. You should see that the racket rocks in one direction and the hand in the opposite direction. This is a “Live Arm”
The feeling is completely different
Once you achieve a “Live Arm” reproduce it and get the same feeling when hitting your tennis strokes.
The loose effortless power will be obvious.
Use the Live Arm technique and Energize your strokes effortlessly.