I’m going to go against the grain and say do not supplement with creatine. I was told by a coach that I trust that it has something to do with either adding or secreting water in your muscles (I can’t remember which) in a very harmful way for endurance athletes. I was having similar problems the OP described with leg’s feeling heavy and was talking with my coach at the time. The conversation came up with my coach in terms of a protein powder I was using for recovery (Combat Powder) and said to throw it out and start using an endurance focus one (Scratch, 1st Endurance, etc…).
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