Red Muscle is suited for endurance activities.
Endurance type activities
Muscular endurance is the ability of a muscle group to sustain repeated contractions or muscle movements over a prolonged period without getting fatigued. This type of endurance is important for activities that require prolonged, repetitive muscle contractions like running, cycling, or swimming.
Cardiac (heart)
Short muscle bellies generally provide greater strength and power due to their ability to generate force more quickly. Long muscle bellies, on the other hand, are better suited for endurance activities as they can sustain contractions for longer periods of time. Overall, the length of the muscle belly can influence the muscle's function and performance based on the type of activity being performed.
The two main muscle fiber types are slow-twitch (Type I) fibers and fast-twitch (Type II) fibers. Slow-twitch fibers are better for endurance activities as they are more resistant to fatigue, while fast-twitch fibers are better suited for explosive, powerful movements.
Pink-colored muscle fibers are typically classified as Type IIa fibers, also known as fast oxidative fibers. These fibers have a moderate resistance to fatigue and are capable of both aerobic and anaerobic energy production. They are well-suited for activities that require both strength and endurance, such as middle-distance running or swimming. The pink color is due to a higher myoglobin content compared to Type IIb fibers, which are more white and primarily anaerobic.
endurance
Obviously, shedding sweat in the gym, helps improve your muscle endurance power. However, if you are over 50, free hand exercise, morning walk,jogging etc. will suffice to for your muscle and body as a whole.
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Core training
Slow-twitch fibers are also called red oxidative fibers. These fibers are more efficient at using oxygen to generate energy and are suited for activities requiring endurance and sustained low-intensity effort.