To improve your aerobic capacity<span>, complete 20-30mins of work at </span>your<span> 3-5km race pace broken down into intervals, with 50-80% of the interval time added as recovery. For example, a runner with a 5km PB of 25mins could run 6 x 1km repeats, aiming to run each in just under 5mins, with 2:30mins recovery.</span>
I think 1,2,and,4 are true
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