When your muscles work hard, a protein called creatine kinase can clump together in a special way inside energy factories (mitochondria), and this helps make energy faster right where it's needed — kind of like creating a pop-up power station in your muscle cells.

Your muscles use creatine like a fast-charging battery to keep energy flowing during intense exercise, shuttling it quickly where it’s needed most—like a delivery service for power.

In resting human muscles, a molecule called phosphocreatine can travel far enough to deliver energy where it's needed, even between distant parts of the muscle cell — kind of like a tiny energy shuttle making the rounds.

Creatine helps shuttle energy from where it's made in the cell to where it's needed, kind of like a rechargeable battery moving power from a charger to your phone.

After a couple of hours of moderate cycling, men's muscles may get better at shuttling energy around, helping them perform better in future workouts.

In fat cells that burn energy to make heat, there might be a cycle where creatine gets charged up and then drained over and over, releasing energy as heat and keeping the cells' energy engines running.