I was definitely looking forward to more footage after having made it through the 40 seconds of undulating camera work (no offense towards your daughter).
From what I’m able to gather from the film, here’s my coaching points with respect to things that you can fix from one rep to the next:
- I prefer to see bladed or at least more relaxed hands. In my experience, anything resembling a fist inevitably transfers to tightness/rigidity in the shoulders/neck/face.
- It looks to me like you raised your line of site slightly prematurely. I look for the cervical spine and chin to rise as one unit along with the remainder of the thoracic/lumbar/sacral regions of the spine and it looks to me like your chin, and line of sight, rises earlier than the rest of you.
In my view, any sprint that is initiated from a motionless start, whether from a push up, 3pt, block start, or standing/falling start such as the one you used in the video, is a mechanism of improving early acceleration/drive phase.
This is so because of the forward lean that comes along with starting void of a pre-run. Consequently, my approach is to look for and instruct drive mechanics that correspond to the body position during the start and acceleration specific to the type of starting position that is used.
From a standing/falling start, the takeoff is obviously not as horizontal as the other variants; however, drive mechanics still apply.
As far as what others have mentioned, regarding stepping over, knee drive, and so on, I think it looks solid.
I’m not willing to speculate much more beyond those technical aspects that I mentioned without seeing more video in slow motion.
For future reference, even if your child is assisting you, if there is a hand rail, garbage can, picnic table, etcetera, nearby, she can place the camera on top of it and us it as a make shift tripod.