I agree on the Cordygen but why creatine? I took Cre-02 pre judo and I have never felt so pumped in my life! In other words,the pump in my shoulders and forearms kept me from being able to move the way I needed to in order to be able to execute my throws.
I could picture the same thing happening with mountainbiking utilizing creatine as a pre-mountainbiking supp with the result that your legs are too pumped to perform.
I would use Citrulline Malate or Beta Alanine for the burn. Citruvol and Carnage from MST fit the bill.