Anna and Rick go head to head in The Running Channel Lactate Step Test Challenge. The rules are simple: each of them starts at their marathon pace. Every 2 minutes the treadmill speed goes up. Who can stay on the treadmill for the longest? Watch and find out. Oh, and of course there’s a forfeit for the loser! Take The Running Channel Challenge for yourself on Zwift and see how you stack up against these two.
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