These are looking good 👍 You have a good handle on the concept of squash and stretch in the torso and your figures are dynamic as a result. I think you can apply the same energy to the arms and legs in these drawings; the singular line works but doesn't provide much information if you were to continue refining these poses. Be intentional about your use of straights and curves; straights represent structure and weight, and curves counterbalance the stiffness of the structure to form dynamic shapes. When you're working on these quick gestures, a straight line can be used to show a very simplified rhythm which can be defined more by the specific rhythms later. You're on the right track with these! Hope this is helpful to you.