Think you need expensive lab tests and endless zone 2 miles to build your aerobic base? Think again. In this episode, we're breaking down exactly how to build your engine the right way - from setting your actual training zones (spoiler: your watch is probably lying to you) to knowing when easy work helps and when it's holding you back. Whether you're training 5 hours or 15 hours a week, we'll show you how to avoid the mistakes that keep most people spinning their wheels. Plus, Kieran and I ge...