Clay Aiken is in rehearsals for Spamalot on Broadway right now, so I'm hoping this is what the following quote is referencing. You're always welcome to make your own assumptions though!
"I'm sore. I couldn't even get off the toilet the other day. It hurts so bad. I don't know if it's I'm not co-ordinated or using muscles I never had to use before. My legs are suffering. Having to remember 'three, four, five,' I can't move and think at the same time!"