Gave this a go this evening, but for fast 5k initially.
4 x 1km at 3.50 / km, with rest period to allow heart rate to return to under 60 percent of max. The last one was grim.
@deleted started
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Gave this a go this evening, but for fast 5k initially.
4 x 1km at 3.50 / km, with rest period to allow heart rate to return to under 60 percent of max. The last one was grim.