ISSA Study Guide 2026

Mitochondria are the "powerhouses" of the cell, converting nutrients into ATP (adenosine triphosphate) through cellular respiration, providing the energy needed for cellular functions.

Explanation: Reciprocal inhibition occurs when one muscle simultaneously contracts while its antagonist relaxes, resulting in normal movement. On the other hand, altered reciprocal inhibition occurs when the agonist muscle is overly tight. This causes inhibition of the antagonist muscle and results in altered movement patterns. An example of altered reciprocal inhibition is having a tight psoas, which decreases neural drive of the gluteus maximus.

Explanation: Eating less than 1,200 calories per day can have adverse health effects. That is why as a fitness professional you should encourage your clients to eat small, frequent meals and to consume at least 1,200 calories per day to ensure that they are receiving proper and adequate nutrition.

Professional certification in specific knowledge areas demonstrates that practitioners have met established competency standards, ensuring quality of service and public protection.

Competency-based training focuses on learners demonstrating mastery of specific, defined competencies before progressing, ensuring they can actually perform required skills rather than just completing seat time.

A wireframe is a simplified, low-fidelity visual representation of a design's structure and layout, used for planning and communication before detailed design work begins.