Can I Suffer Spinal Injury From Doing Too Much Dolphin Kick?

So recent few weeks, I’ve been practising butterfly, especially dolphin kick, bout 3 hours a day. My back and abs often feel ache, and I’ve grown taller, but I was wondering whether it is possible to get spinal injury from doing too much butterfly?
I’m not afraid of the pain, coz I want to improve the most, but I don’t wanna have a spinal injury and not be able to walk bcoz of it.