"The only advice we have to those seeking to push themselves through the original back-to-basics boot camp? Stick it out. The seven days of crazy-long hikes, intense workouts, and a cleansing, vegetarian diet will be hard work, but it will also whip you into shape. Not for the faint of heart (or the fussy), this no-frills, no-excuses program is no less grueling (or cushy) than it is in Mallorca—but the OG Calabasas location is just far enough removed from city life to feel like a quiet respite, too. "