Common training variables include: (1) Contraction mode (eccentric, concentric, isometric, or stretch-shortening cycle), (2) relative load (percentage of one repetition-maximum), (3) external load type (constant load or elastic resistance), (4) range of motion, (5) exercise selection, (6) volume, (7) proximity to failure, (8) rest period duration, and (9) repetition duration (tempo).
