What happens next in this paragraph?

How to get started in parkour or free running
Get in shape.
You must have endurance. Work on basic calisthenics like push-ups, pull-ups, sit-ups and squats.
Select from: A. Once you reach training number 14, start working on muscle bulk exercises like bench presses, pull-ups, crunches, jump jacks, push-ups, and pole jumps. Once you're comfortable with these exercises, you can start earning your ged.; B. Do cardio an incorporate other fitness like high-intensity exercises. You need to do these for the entire length of the day.; C. These are the basic building blocks for practicing parkour. Experts say you should be capable of performing 25 push-ups , 5 pull-ups and 50 full squats before you formally get started in parkour.; D. Cardio can make you work harder and you might need more endurance endurance with training. Aerobic or dynamic exercise can make you better at parkour and free running is not for everyone.;
C.