Daniel Kiikka

Muscle contraction occurs when actin and myosin filaments slide past each other. Thus, resulting in the shortening of a sarcomere.

The neural adaptations of strength training refers to improvements in motor unit recruitment and rate coding. Click here to learn more!

Muscle satellite cells are stem cells found between the external lamina and sarcolemma. They play a crucial role in muscle fiber regeneration.

The push/pull/legs split refers to dividing your weekly training into push (chest, shoulders, triceps), pull (back, biceps), and leg (quads, glutes, hamstrings, calves) days. It…

The size principle means that motor units (motor neuron and muscle fibers innervated by it) are activated in an order from smallest to largest.

The all-or-none law states that if a stimulus exceeds an activation threshold, all the muscle fibers in a motor unit are simultaneously activated, and at full force.

The upper body/lower body split divides your muscles into two groups, allowing you to focus on specific muscles on different days of the week. Here's what you need to know!

Periodization refers to dividing your yearly conditioning program into smaller blocks (microcycle, mesocycle, and macrocycle). Each phase has a specific training focus.

Workout splits refer to different ways of dividing your exercises throughout the week. There are several ways to do this. Here are the most common ones!

Heart rate zones can be used to determine optimal training intensity. They are calculated as percentages of your maximum heart rate.