Dumbbells, barbells, kettle bells, and medicine balls are generally considered what type of equipment?

Isometric resistance training involves static muscle contractions with no joint movement or change in muscle length; free weights inherently allow and promote dynamic motion.

Isokinetic equipment controls the speed of movement throughout the full range of motion and requires specialized dynamometer machines such as a Biodex; free weights have no velocity-controlling mechanism.

These implements are 'dynamic' because they permit joint movement through variable planes and ranges of motion rather than restricting the path of movement. They are 'external resistance' devices because the resistive force originates outside the body, distinguishing them from bodyweight training. Together, these characteristics define the category of free-weight implements used in strength and conditioning.

Static constant external resistance more accurately describes cable-pulley systems that maintain consistent tension magnitude; free weights change their effective resistance vector with limb position and do not remain static.