Second Nature

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You've Heard of Heat Training. Here's How It Actually Works.

June 26, 2026

Ross McGraw has had one of the more interesting career arcs in the outdoor industry — from Nike's NYC Run program to Vice Media and Viacom, to helping build Hammerhead through its acquisition by SRAM, and now leading commercial efforts at CORE, the company changing how elite athletes think about heat. In this conversation, Ross breaks down the science of heat training in plain language — why 80% of the energy athletes generate is thermal, how heat zones work, and why the world's best cyclists...

The One Question Every Brand Needs to Answer

June 19, 2026

Mattie Sims has built brands at Lululemon, Electronic Arts, Reef, and Rally Pickleball — and along the way developed a framework for brand building that most founders skip entirely. Now she's applying everything she's learned to two ventures at once: Courier, a performance sock brand built around the idea of the "Renaissance athlete," and Mate the Agency, a brand strategy firm working with founders across industries. In this conversation, Mattie walks through the muse framework she learned at...

The Sunscreen Brand That's Rewriting Performance Science

June 12, 2026

Tom Austen is the founder of Pelotan, the world's first sun performance brand, and co-founder of Chance, a trail running apparel brand he's building with pro athlete and serial entrepreneur Christian Meier. Both brands are based in Girona, Spain — a two-square-kilometer pocket of world-class endurance athletes, cafes, and startups that's become the Boulder of Europe. In this conversation, Tom walks through how Pelotan went from a sunburn problem on training rides to winning two Tour de France...