Fitness Dictionary
by Justin French








Inversion – Moving sole of foot toward medial plane.

Intensity - The relative degree of effort that you put into each set of every exercise in a bodybuilding workout. The more intensity you place on a working muscle, the more quickly it will increase in hypertrophy. The most basic methods of increasing intensity are to use heavier weights in good form in each exercise, do more reps with a set weight, or perform a consistent number of sets and reps with a particular weight in a movement, but progressively reducing the length of rest intervals between sets.

Isokinetic Exercise - Isotonic exercise in which there is ACCOMMODATING RESISTANCE. Also refers to constant speed. Nautilus and Cybex are two types of isokinetic machines, where machine varies amount of resistance being lifted to match force curve developed by the muscle.

Isometric Exercise - Muscular contraction where muscle maintains a constant length and joints do not move. These exercises are usually performed against a wall or other immovable object.

Isolation Exercise - In contrast to a basic exercise, an isolation movement stresses a single muscle group (or sometimes just part of a single muscle) in relative isolation from the remainder of the body. Isolation exercises are good for shaping and defining various muscle groups. For your thighs, squats would be a typical basic movement, while leg extensions would be the equivalent isolation exercise.

Isotonic Exercise - Muscular action in which there is a change in length of muscle and weight) keeping tension constant. Lifting free weights is a classic isotonic exercise.

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