When skeletal muscles are trained by adding physical stress to them, this is called progressive resistance training muscle endurance isometric exercise training isotonic exercise training

When skeletal muscles are trained by adding physical stress to them, this is called progressive resistance training (PRT).

Explanation:

During PRT, muscles are exercised against an overload or resistance; the overload is gradually increased in order to allow muscles to adapt. This allows for progressive strength increases over time.

Muscle fatigue is defined as a reduction in the ability to produce force due to exercise. This comprises:

Overall, these may affect muscle fiber activation and the amount of force they are capable of producing- i.e. sustained strength. However, muscle fatigue  can be greatly reduced via the maintenance of PRT. Also, apart from strength gains, PRT is used for weight loss and muscle building; common tools used in PRT include free weights, elastic bands and exercise machines.

answer: proteins

explanation: complement is   system of circulate in the blood in a inactive form

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