What does interval training do for an athlete?
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a. it makes muscles stronger so they can exert more force.
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b. it lengthens the amount of time the athlete can intensely exercise,
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c. it can greatly improve finish times in races and competitions.
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d. all of the above.

Interval training has been used by athletes for years to build fitness. Interval training combines short, high-intensity bursts of speed, with slow, recovery phases, repeated during one exercise session.

so D all of the above

answer: b. reduces acid production to slow digestion