What is some good techniques that you could use when running the 800 meter dash and the mile and the relay?

Question

and iam a girl and endurance

Answer 1

Why are you asking this under swimming and diving? You'd be better asking it under the appropriate category.

Answer 2

keep a steady pace, make the second lap faster than your second. If you start out too fast, your second lap will be alot slower. Do speed workouts and distance workouts.