Follow journalist Rowan Jacobsen into the fungal underground of Europe and Appalachia

The Pixel Watch 4 is smarter, prettier, and longer-lasting, but it’s still not built for the outdoors.

Two hunters were killed by a lightning strike in Colorado, plus Polish ski mountaineer Andrzej Bargiel skied from the summit of Mount Everest without the use of supplemental oxygen. Outside has you covered in this edition of our weekly news roundup.

Plus, advice for breaking up with your running buddy

Our articles editor seeks guidance from the Skiers Responsibility Code on how to avoid fisticuffs on the slopes

She was the only hiker ever to die while seeking the summit of central Colorado’s most famous 14er. A member of the successful search team investigates who she was, how her death—and her recovery 19 years later—impacted her family, and what we all need to consider before heading into the alpine.

The new science of skill acquisition can help coaches and athletes get more out of their workouts

How long your walks are—not step count—may influence your long-term health, according to a new study

How two adaptive athletes seamlessly integrate Aventon’s versatile e-bikes into their active lives

Scientists propose a unified framework for describing how intense your workout is