You are in two (part-time) jobs and still find time to study and exercise? Wow! you must be a superman! such energy/stamina!
You might be a superman! you work in two jobs and still find time to study and workout? wow! I wish I had such stamina!
You are a hero! I admire people who manage work ( also studying at college), working out/exercising and at the same time! you are a dynamo! I admire you for that!
Wow, I am amazed at you, I am amazed at anyone who manages to work in two jobs adn still work out! and jealous!
....where do you find such stamina?/that much stamina?
It´s just remarkable/amazing how much stamina you have. Working in two jobs....yada yada yada.
This is my (tentative) stab at it, but I do appreciate natives comments/tinkering/proofread of it. Since, it might be more terse or natural in other ways, so the ball is in your court now, guys.