i hate that pain.....
about a month ago after landing a little gap i rolled forward on dirt surface which was covered with high grass so i couldnt see a little hole in front of me, my front wheel got stuck in there and stopped the bike, but as i didnt saw the hole i was thinking that i will roll forward, but when the bike suddenly stopped my body moved forward from the hips and i think i streched out one back muscle.....i didnt ride for a week and went to a competition, it hurt just a bit later but nothing much....rested 2 more days and then i could ride with no problems
a few days ago it came back, probably because of cold wind....i was still able to ride until today, about after 15min of riding it was just too painful
ive got a competition on sunday so ill rest until it and hope i can ride there....