It's hard to judge by leg soreness alone. The basis of judgment should be that the head, back and legs are completely attached to the wall.

In fact, you can also practice flat support, which also has a good effect on correcting the shape of shoulder and back.

Moreover, the exercise effect of flat support on the core strength of the body is recognized in the industry and can also be used as a precursor to fitness.

There are many pictures and detailed tutorials on the specific standard movements online. Do it.

The most important thing is persistence, patience and perseverance to achieve good results.