i want to improve my cardiovascular endurance, i am 15 years old and i am a female. I get too tired too easily when i run and end up stopping so i want to be able to build up my endurance. i am thinking of going to my school gym after school 2 or 3 times a week. they have treadmills, eleptical trainers, rowing machines, bike and those weight machine things. I am not fat and i am quite small about 5 foot 1 (or a bit over). i was wondering how should i begin running. i am intersted in high intensity interval training but i heard that you have to be able to run 20-30 minuted straight to be able to start. can anyone reccommend what should i do there before i can start interval training or can i start interval training straight away? how lond should my workouts be? i am not totally unfit - i can run a bit just not for too long(i also want to become quite fast and to be able to recover quickly) Thank
you
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