Aero wins races before the first pedal stroke - and most cyclists are spending money in the wrong place. Frederik Muff, Fusion’s aero specialist and a Danish time trial record holder, breaks down what actually makes you faster, from the one change that can save real watts to the products that are mostly marketing. Frederik has set Danish records in 10, 30, 50, and 100 km time trials, and he brings that racing experience into the wind tunnel every day. He and i get into the details that matter most for triathletes, time trialists, and serious cyclists who want speed that actually shows up on race day - not just in a product launch claim. You'll discover why body position beats almost everything else, why the helmet-suit-position system matters more than any single part, and why a “faster” setup in the wind tunnel can still be the wrong choice in the real world. Frederik also explains when aero starts to matter, how much resistance comes from the air, why headwinds hurt so much more than tailwinds help, and why the best athletes are often the most willing to experiment. We break down where to spend 1,000 euros for the biggest return, what not to waste money on first, and how Fusion approaches testing with elite riders like Mattias Skjelmose, Magnus Ditlev, and Sam Laidlow. Frederik shares the biggest gains he’s seen, the weirdest surprises the tunnel has revealed, and why sometimes the most valuable test result is finding out nothing needs to change. He also pulls back the curtain on how a wind tunnel actually works, how repeatable measurements are, how aero claims get gamed, and why outdoor validation still matters. If you’ve ever wondered whether deep wheels, aero helmets, skinsuits, or lower positions really make the difference, this episode gives you the answers that matter. Perfect for triathletes, cyclists, and endurance athletes who want to stop guessing and start making smarter aero decisions.