Quick fact. Ready? There are many muscle fibres within your muscle. Each 'twitch' from a muscle fibre produces a set amount of force. When these twitches occur rapidly, there begins to be a summation of force in which the force that is produced continuously increases. This progresses until the muscle reaches its maximum force output, and must then stop its muscle fibres from twitching.

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Quick fact. Ready? When we stand on our tippy toes or wear high heels, we are reducing the area of contact between our tibia (a shin bone) and talus (a foot bone). In this state, one is more vulnerable to injury due to the lower amount of stability between the two.