In an interview with Netarika, chiropractor Yuji Ogawa goes on to explain why he thinks Frieza's poor posture contributed to his ultimate undoing when stacked up against Goku. At first glance Frieza appears to look like he sits slightly forward in his hover pod, when you see him from head on:
But from the side, he is definitely uber hunched over...
Here's a normal person's spine compared to what Frieza is working with:
All in all, with a bad back our handy chiropractor claims Frieza was doomed from the get go.