its really hard i need help
This is called aerobic exercise. All aerobic activity requires oxygen.
Aerobic exercise requires oxygen, anaerobic exercise does not. Aerobic exercises include walking, running, swimming, and jumping rope.
Aerobic exercise
Walking is primarily an aerobic exercise, as it involves continuous movement that requires oxygen to fuel the muscles.
That is called aerobic exercise.
Biking is primarily an aerobic exercise, as it involves sustained, rhythmic movements that require oxygen to fuel the muscles.
Aerobic exercise means your muscles are getting exercised at a rate where the muscles are not being depleted of oxygen faster than the blood, from the heart and lungs, can supply it. This allows the muscles to work at maximum efficiency. Aerobic exercise will not reduce the strength, size or endurance of muscles, but it will not help increase them. To work on increasing those, exercise needs to be anaerobic/resistive: high load for short periods. It is best to combine resistive and aerobic exercise to achieve all round strength and fitness.
You are more likely to get cramps during anaerobic exercise than during aerobic exercise. This is because your muscles are lacking oxygen.
Because the blood is diverted to the working muscles instead, as they need the more blood in order to provide oxygen for aerobic respiration
delivering more oxygen and nutrients to the cells' muscles improves the peripheral circulation, thus making muscles stronger.
Riding a bike is considered an aerobic exercise because it primarily uses oxygen to fuel the muscles during sustained physical activity.
intermediate and slow twitch muscles because aerobic exercise require oxygen to prove its energy source.