This exercise is an essential tail movement for animation.
A bouncing blob with a tail presupposes that the blob is a weighted bouncing ball and that the tail can also sway naturally with the mass of the ball. When the ball makes its first bounce, it should take longer to hit the ground to build up momentum for the second bounce. In terms of the tail swing, it should swing at a greater angle. Personally, I don’t think this work was done very well and will adjust it later.
Changing the tail for the second time to make it softer.