My hands said no more today, and with the back still aching, I decided to forego this training. I decided to read a bit more on what I was doing wrong to suffer from back soreness when it wasn't supposed to happen with kettlebell swings.
After all, it seems my whole approach was wrong, not only to swings but also to deadlifting. Thank god my grip strength never allowed me to deadlift big loads. I am by no means a very experienced lifter, and while for some time I had coaching (it was one coach for 1h a week for 12 players on the rugby team, so it was pretty limited). I have read Mark Rippentoes Starting Strength, and that was the base plan I followed when I began. That was the way I was trying to perform the exercises.
Fast forward to today; and a re-read of Rippentoe's book and some additional research. I am not squatting the way he shows, I am using a high bar squat. That means I am not driving my butt backwards that much nor using hip drive. Somehow, my deadlift never managed to surpass my squat. Now I can see why, I never pushed my butt backwards, never used hip drive. My deadlifts were quad based, but somehow limited by grip. If I switched to alternate grip, my back wouldn't be able to hold the weight and thankfully I would stop to prevent injury.
The kettlebell swings were a crossbreed of a squat and a proper swing, it would also be a slowish movement. The high volume of the challenge led to a improper form (or to say it correctly, even worse) and therefore back pain.
At the very least I now know what I was doing wrong. Despite the back pain, mimicking the swing movement without weight but incorporating hip drive shows that the hamstrings get a lot of tension, the gluts get tight, and I can explode a lot more.
Is there any reading material you can recommend? Either for high bar squats (I feel very uncomfortable in the low bar position, the bar seems to get no support). It is possible a lack of flexibility led me to start with the bar in the high position and now it seems hard to change to the lower one. Reading material for deadlifts would also be welcome, as well as kettlebell swings.
I guess the first step to correct things is realizing I was wrong and be willing to change, so I got that going for me, any help is welcome