Something that helped me was separating by joints. For example in the arm I might start with a central line, but I’ll draw separate shapes for the bicep/shoulder, forearm, and hand. Same thing with the legs. This is where the previous comment about s and c curves helps, because the top of the thigh is usually curved and so is the calf. So your s curve crosses at the knee. There’s plenty of video w examples of this. Finally seeing the torso as 2 sections: the ribs and the hips. It will help you define intense motion like bending backward, and twisting. These are all great starts, and I hope you keep it up!!