This is not a boot camp," says Los Angeles-based trainer Ashley Borden about the five-day fitness retreat she runs at the Four Seasons in Punta Mita, Mexico. Okay, but you won't be drinking mango margaritas with chips and guacamole, either. Instead, it's red snapper and grilled veggies and protein shakes in your oceanfront casita (Borden cleans out the chocolate-covered cherries before you check in). And when you're not eating, you're exercising. Each day begins with an hour-long power walk, followed by a 90-minute session of strength training. The last workout centers around a 20-minute heart-rate-spiking drill on the treadmill. It's rigorous, to be sure, but the gorgeous Pacific setting and the Four Seasons' service keep the exercise from seeming like punishment. Borden, for her part, makes things lively, mixing trainer mumbo jumbo ("myofascia release") with plenty of one-liners. By the end, you'll want her by your side 24/7. That's possible, too; Borden can be yours for $14,000 a week. Rooms, $495-$10,600; retreat, from $3,500; www.fourseasons.com; www.ashleyborden.com.
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