Hi Lyanna, welcome! I admire your enthusiasm and aspirations to join the fire service. Honestly, I’ve been training and preparing for the Academy for 6months and the best type of work out is calisthenics, functional movements and lots of cardio (stairs, stairs, stairs). When your absolutely gased and feel like you can’t push anymore, force yourself to do rounds of burpees, squats, pushups. Rinse and repeat! Focus on getting your VO2 max up. That is a measure of your aerobic endurance. This will help immensely in the fire service. You will need to get comfortable feeling uncomfortable, and then feel the burn.