Originally Posted by
MoAlpha
Great effort! The next one will be easier.
Lower back: As others have said, you need to get used to spending time in that position. However, I strongly believe that being comfortable on the bike, particularly low and comfortable, is largely a matter of strength in the posterior chain, centered around the glutes, which support the lower back and spare the paraspinal muscles, which are what hurts. This is why I love deadlifts, but there are lots of great exercises which will do the same thing.
My back never really hurts on the road bike, but my lower back does start to hurt on the mountain bike after a while. I also have a desk job and don't exercise outside of cycling.
I keep telling myself that I'm going to start bodyweight workouts and start stretching, but I never have the motivation. I know it will help in the long run, but man I hate it in the short term.