So this is more advice rather than homework help but I’m confused as to what this is asking. Is this referring to an actual workout routine like “jumping jacks+ squats +lunges”or by workout it just means a bike ride (just one activity)

Answer: Either.
Explanation:
Aerobic and anaerobic are the two exercise categories. Basically meaning you can choose any exercise that you'd like to do for the assignment. If you want to do a routine with multiple, go for it. But if you want to just one activity for your workout, that's fine as well.