There are a multitude of benefits to circuit training, other than squeezing a helluva lot of work in to a small window of time, aka, efficiency! Circuits are fabulous fat burners due to the number of muscles being recruited (muscles burn fat. Better muscles burn MORE fat – during and post exercise. See EPOC effect) The criteria of Circuits: + A number of exercises, generally 6 – 12, which you attack in rapid succession with no more than 30 seconds rest in-between + Reps ran