I always dream that I can't keep up with others' footsteps, and my legs don't work, as if I were too heavy to keep up with others' footsteps.

Brother, I often had this dream before I fell in love with sports. You should strengthen your leg muscles and run often. It is best to run with weight and do squats with Smith. I have such a dream that people can't run fast, even if they lift their legs with their hands and press them down to walk.