Whether you're enjoying a session in the home gym, local park or somewhere a little more commercial; make sure you're wearing one of these.
Via The Adventure Blog : a team negotiating Everest’s Khumbu Icefall (generally considered the most dangerous part of the climb) in May last year. Nothing but respect for those guys.

"Sonnon is without doubt one of the top conditioning coaches in the US, the thinking man's coach. He is the hologram man. Try and hit him and he disappears."
- Pavel Tsatsouline
Are you ready for Tacfit?
A few others you might like :
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