I like what Rockin' through at you plus for distance your doing 25 min for 3 miles is VERY slow! At 15 yrs old you need to break that time down to about a 7 minute mile (21 min) then 6:30 and then 6 minutes per mile! I can actually remember my times as a 15 yrs old and was performing 5:05 a mile for 2 miles, then hit the final mile at about 6;10! However I was in great shape to be able to do that and at a low weight then. At 20 years old I couldn't duplicate that even in fight shape!
Distance and Sprints along with different surfaces sand, grass, gravel, to working incline decline and stairs. When your trying something new start slowly and don't do much always crawl, walk to be able to run. As a young man you won't think of injuries but your still growing and long bone development may not be completed if you have height and more weight to gain. Any injury at your age to long bones can stay with you and become chronic for life! Go slow and yes I forgot swimming!!!! Same method applies distance and sprints and learn to swim before trying this!
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Why are you sitting there?..........................GO!
Ray.
Distance and Sprints along with different surfaces sand, grass, gravel, to working incline decline and stairs. When your trying something new start slowly and don't do much always crawl, walk to be able to run. As a young man you won't think of injuries but your still growing and long bone development may not be completed if you have height and more weight to gain. Any injury at your age to long bones can stay with you and become chronic for life! Go slow and yes I forgot swimming!!!! Same method applies distance and sprints and learn to swim before trying this!

Why are you sitting there?..........................GO!
Ray.
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