Final answer:
Cycling for pleasure and general calisthenics fall under the category of aerobic exercise.
Step-by-step explanation:
Aerobic exercise is any physical activity that uses muscles at less than their maximum contraction strength but for long periods of time. It uses a relatively high percentage of slow-twitch muscle fibers that consume large amounts of oxygen. Examples of aerobic exercise include cycling and brisk walking.
Anaerobic exercise, on the other hand, uses muscles close to their maximum contraction strength but for relatively short periods of time. It uses a high percentage of fast-twitch muscle fibers that consume small amounts of oxygen. Examples of anaerobic exercise include push-ups and sprinting.
Based on this information, cycling for pleasure and general calisthenics would fall under the category of aerobic exercise.