I really like your line quality and shapes! What you could try doing more of is drawing a main line of action that goes through the whole figure before showing the contour of the figure. (You do this already in your drawing of the person sitting down) This line should show the main motion. It usually follows the spine, think of it like a skeleton for the movement. Using C,S, and I lines like @Adam Wiebner said is helpful for this. I've attached some examples, they're not very well done as I used my finger and ms paint, but hopefully they get the idea across. Please let me know if you have any questions!

@danielcrespo63 Gesture drawings look good, i see good sense as to story of the poses! As Stan mentions importance of C, S and I lines, perhaps you can consider if you can use a little more often I or straight lines to contrast with curves. I hope that helps.

Overall, it looks to me as you understand the idea behind 30sec gestures. I would say the best way to improve from here would be to do a whole lot of them, as in hundreds or thousands. This will help you build up your mileage and lead to improvements.