A series of exercises in a row with minimal or no breaks in between.

Exercises that work multiple muscle groups at the same time. Example a deadlift works hamstring, glutes & back

The movement of the exercise where you are shortening the muscle length (opposite of eccentric)

DOMS stands for Delayed Onset Muscle Soreness.

The movement of the exercise where you are lengthening the muscle (opposite of concentric)

 A form of exercise involving the static contraction of a muscle without any visible movement in the angle of the joint.
For example a plank (no movement but still working muscle groups)

When the muscle is simply unable to perform another repetition.

A growth in the size of muscle cells done via working out.

Increasing the load on our muscles over time.

Short for repetitions which is the number of times you perform a complete motion of a specific exercise. 12 squats = 12 reps

The number of cycles or rounds of reps that you complete. For example, 12 reps x 3 sets (rounds)

You complete just one exercise, back to back with rests in between

Two exercises back to back, rest after second exercise.

The speed at which you complete the whole movement. The number of seconds you spend doing each phase of the exercise. The exercise is broken down to 4 parts, the concentric, pause, eccentric, and pause again (between reps). 

Time Under Tension: the amount of time that your muscles are under tension aka working against resistance.

Three exercises back to back, resting after the third exercise.