The push-off thing might be a good exercise, but I wouldn't get too discouraged if you don't meet a 'standard', since our bodies are all different. I am terrible at this push-off thing due to my extreme forwardly-positioned center of buoyancy. My legs sink quickly! Sinking legs cause drag, which prevents forward progress. I have not been able to overcome this (in a superman glide) by any special attention to posture.
I would think your mileage may vary also, depending on how deep the pool water is. If more shallow, say 3.5', you'll get more of a push with your legs and more velocity, therefore longer glide. If the water is deeper, say 4.5', you'll not have as much traction on the bottom to push with, so your glide will be less.
But I can still swim. Learning full stroke requires innumerable adjustments (by arms, kicking, etc) to attain horizontal position in the water...and gets even more complicated when incorporating breathing.
Last edited by novaswimmer : 11-13-2017 at 02:38 PM.