Fixie Suffering-fun

So today I did my second consecutive apres travail, hard, for my current state of (un) fitness, ride on my recently fixed 29er and I gotta give kudos to Sheldon Brown for getting be to try it.
A little slower than my road bike, expected, and a bit harder, expected. But more fun, as I had read. Stopping without using the front brake is now a challenge...instead of blowing through stop signs to conserve momentum. Rear brake is in the basement. Don't know if my knees can take it. We will see. I expect the fixie will improve the leg much as I have read. Look forward to riding geared rigs in the future to see.