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Youtellmehoney
Are there options? It can be a wide choice to choose from and would help if you could be more specific. 
thatonegirlie

Answer:

From personal experience I'd say that push-ups, military press, and bicep curls were the hardest for me because I barely have any upper body strength.

Explanation:

Assuming you are talking about the Cardiorespiratory Fitness and Endurance.