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Photo: "Axios on HBO"

After a sit-down interview with Apple CEO Tim Cook for "Axios on HBO," Axios got a tour inside the exercise lab Apple uses to make sure its watch can accurately track your workout of choice — whatever that might be.

Details: Parts of the lab resemble a gym, with dozens of treadmills, rowing machines and other exercise machines. There's also a yoga room and an endless pool, which allows Apple to better track how people are swimming — as different strokes burn different amount of calories.

What makes Apple's lab quite different from any gym are the bulky masks you see on each of the people working out. Known as a metabolic cart, the machines precisely determine just how many calories are being burned in each activity.

Then there are the 3 temperature-adjustable rooms (dubbed Higher, Faster and Stronger) that can be made extremely hot or very cold.

"We have done over 50,000 sessions of data collection which is almost 100,000 hours of data being collected. That includes over 12,000 unique participants so it’s a very diverse set of data as well which is really important because obviously, everyone’s body is different and we want to understand as much as we can about different types of people."
— Apple's fitness director Jay Blahnik

The bottom line: That adds up to a huge bet on health and fitness. The Apple Watch available today is just the beginning.

Go deeper

Updated 5 mins ago - World

Russia says it fired warning shots at British destroyer in Black Sea

The HMS Defender in the port of Odessa on Ukraine's Black Sea coast on June 18. Photo: Konstantin Sazonchik\TASS via Getty Images

A Russian warship and fighter jet fired "warning" shots at the British Royal Navy’s HMS Defender destroyer for encroaching on waters near Crimea in the Black Sea, Russia's defense ministry said Wednesday.

The latest: The U.K.'s ministry of defense disputed that any warning shots were fired, saying in a statement, "We believe the Russians were undertaking a gunnery exercise in the Black Sea and provided the maritime community with prior-warning of their activity."

Mike Allen, author of AM
Updated 30 mins ago - Politics & Policy

First look: WaPo Trump book's secret title revealed

Cover: Penguin Press

The Washington Post's Carol Leonnig and Philip Rucker will be out July 20 with "I Alone Can Fix It: Donald J. Trump’s Catastrophic Final Year," Penguin Press announced.

Breaking: Axios has learned that The Wall Street Journal's Michael Bender is moving "Frankly, We Did Win the Election" up to July 20, matching Leonnig-Rucker, from his earlier pub date of Aug. 10.

Shell and GM unveil partnership on Texas power and car-charging

Illustration: Annelise Capossela/Axios

General Motors and a Shell-owned power company will unveil a partnership on Wednesday aimed at providing renewable electricity to Texas customers and free overnight charging to state residents who own GM electric cars.

Why it matters: It’s a new way for two corporate giants to expand their operations in a way that lowers emissions at the customer and supplier level.