Ps can help people lose weight by using liquefaction tools or manipulating deformation tools, but manipulating deformation and slimming is not as simple and easy to operate as liquefaction tools. With the Liquefaction tool, you can adjust the brush size, hardness and other values. If not, you can choose the default, click on the edge and drag it. For example, you can choose a contraction tool and choose a good size for your arms and legs. Pull the legs and arms from top to bottom or from bottom to top, and be careful not to stay, because the place where you stay will shrink excessively. It's the first time to use it, and it may not be skilled enough to achieve the desired effect. Just do it a few more times. I wish you success!