Cardiorespiratory Endurance and Anaerobic Capacity are related - they both have to do with your body's ability to supply energy to your muscles during physical exercise.
Cardiorespiratory endurance, or cardiovascular endurance, comes into play when you do aerobic exercise - exercise where you use oxygen. Aerobic exercise is moderately intense and lasts anywhere from 2 minutes to several hours. You may be breathing hard but your body is able to supply enough oxygen to keep you going for a long time. Your muscles don't feel "the burn."
Examples of Aerobic Exercise:
- brisk walking
- jogging or light running
- most bicycle riding
- easy swimming
Anaerobic exercise is when you are working so hard, your body can't get enough oxygen to keep you going. Your body starts to use anaerobic sources of energy - energy that does not require oxygen. Mostly, your muscles start to burn carbohydrates that they have stored for just this situation. When this happens, your muscles produce lactic acid, the chemical that creates the burning feeling in your muscles when you work very hard.
Anaerobic exercises last less than 2 minutes. Any longer than that and your muscles literally cannot keep working so hard - you have to slow down. When you rest, you will be breathing hard and your heart rate will be very high. Your body is getting extra oxygen, and using it to clean out the lactic acid. With enough rest, your muscles can go back almost to normal, and you will be ready for another intense burst of exercise.
Examples of Anaerobic Exercise:
- sprint running, cycling, or swimming
- exercises like burpees, tuck jumps, or mountain climbers
- resistance training (muscular endurance and anaerobic capacity go hand in hand)
- football
Keep in mind - most sports use both your cardiovascular and anaerobic abilities. Think about soccer or basketball. You're always jogging, moving, and breathing hard, but every once in a while, you need to sprint all out.
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