My clients aren’t exactly requesting to do mountain climbers — they are super tough! But they also torch calories and work ...

Want to know if your endurance ranks in the top 10%? Find out how many mountain climbers you need to do non-stop to prove your fitness level.

Mount Rainier National Park Standing 14,410 feet, this massive stratovolcano presents a formidable challenge for climbers of all levels. With 25 glaciers comprising the rugged mountain ...