What type of structure is shown in this figure? 
Definitions:
Isometric
Exercise involving muscle contractions without movement, typically performed against an immovable object or force.
Isotonic
Relating to muscle contraction where the muscle shortens to move a load while maintaining constant tension.
Aerobic Fitness
The ability of the heart and lungs to supply oxygen to the muscles during prolonged physical activity, indicating cardiovascular health.
Resting Blood Pressure
The pressure in the arteries when the heart rests between beats, providing a baseline measure of heart health.
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