When Creatine is consumed in adequate amounts, muscle creatine saturation will follow. From this, a phosphate group can be donated to Adenosine Diphosphate (ADP) turning it into Adenosine Triphosphate (ATP) which is an integral energy source of skeletal muscle!
Creatine stores (phosphocreatine) are highly mobilisable, meaning our ATP (energy) pool can be replenished dozens of times during an all out maximal exertion lasting between 2-10 seconds...consequently; energy levels will be very high indeed during this short period of time.
Therefore, for brief bouts of high intensity exercise, such as a set of 10 reps on the bench press, creatine could prove to be very beneficial!
These benefits alone lend themselves to gains in muscle size, strength and endurance!
(Greenwood, Kalman and Antonio, 2008)