What type of performer am I?

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Across
  1. 4. A sport this performer might play
  2. 6. Explosive movements over this duration
  3. 7. Needs to drink after exercise to prevent this
Down
  1. 1. A type of nutrient used for muscle growth and to repair after high intensity
  2. 2. Will consume this 1-3 hours before exercise
  3. 3. A nutrient rarely used as there is minimal low-intensity work
  4. 5. During exercise may consume a small amount of this type of carbohydrate
  5. 8. I produce energy without this