Answer:
Here are some good exercises that are FAST to increase cardio fitness:
During a run increase your speed by about 75% for about 15-30 seconds, intervals are crucial.
Mile repeats or 800m repeats with 30 second rests inbetween
HILLS - literally will change you
-hill repeats
-hill sprints
All those are KILLERS for cardio they will improve you in one week and you will keep improving quickly.
Sprinting is also crucial to improve endurance and cardio, sprint repeats, it's really powerful
Have fun with your cardio! :)
Explanation:
