Question

Which exercises were more difficult than others?

Answer 1

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

Answer 2

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.

Step-by-step explanation:

Assuming you are talking about the Cardiorespiratory Fitness and Endurance.