How can you increase your cardio-respiratory endurance?
O
A. Increase the frequency of your cardio workouts.
O
B. Increase the intensity of your cardio workouts.
O
C. Increase how long you do your cardio workouts.
O
D. All of the above.

D, all of the above.

Explanation:

When you, every day, increase ever so slightly the difficulty of your work, then you can be able to sustain longer and heavier workout sessions and more.

Don't suddenly make it really hard, or extra hard, take your time to level up SLOWLY how much the workload/work is.

there should be recorded video of the class under the assignments for the day

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