@Based-Wigglesin r/Sprinting • Recommends
On “Need help with 40yd stance start”
Frankly, your running form is poor all around. I would not expect a soccer player to have good running mechanics, but I would certainly encourage you to learn good mechanics to become a more efficient runner.
Fix your general mechanics first. Then worry about start form.
I would start here:
Posture Basics - link to this video
Accel Basics - link to this video
More Advanced Accel - link to this video
While you won’t be using blocks, the concepts still translate to 3 point starts.