Q by Equinox | Download Essentials: Best Fitness Apps.

With a wealth of fitness apps at its disposal, your smartphone has the potential to become the ultimate personal trainer. But the recent boom in the health and wellness category has flooded the app store with more duds than dazzlers — and finding one that’s sleek, bug-free and physiologically sound is harder than you might think. To help, we asked our in-house app experts, Jay Blahnik and Lisa Wheeler, to sort through the crowded marketplace and identify the few apps that are truly worth downloading today. Whether you want to work on that V-shaped torso or track every mile you run, prepare to meet your new digital trainer.