Yo I notice this been sitting here for a while so lemme give it a shot 1) First thing I notice is that on that first step, your arms aren't in sync with your legs, as your arms reach full extension before your legs do (see image 1). To fix this I'd stay focus less on the arm swing motion and instead to be more loose with the arms, letting them swing naturally, while also being agressive 2) Another thing I notice is that you're reaching way outside of your C.o.M in order to cover as much distance as possible( see images 2 and 3), when really during acceleraation you wanna focus on firing your hamstring and pushing your legs backwards into the ground. Think about it, if you want to move forward, then you have to apply force in the opposite direction, backwards. Overall, focus more on letting that backwards push to propel you forward, rather than reaching to cover as much distance as possible. 3) Lastly, in those first 3 steps, you're cycling, leaving your legs loose and allowing them to come up to your butt, when really your goal should be to slide themvery close to ground (for me,reminding myself to keep the back leg straight helps with this), creating low heel recovery, and getting to that next step as fast as possible. Honestly all of this is impossible to think about mid-rep when your goal is exerting max power, so I suggest you practice these cues in slow motion, walk-thrus, making sure you get the feel of each movement