Which workout?

Best for Your Chest: Pushups target your chest, arms, abs, and back, and the bench press is the classic strength test. But for pure chest-building power, the one-armed dumbbell press can help you stay balanced and heave more weight, fast. The Best for Your Back: Most back exercises are great—they're multi-joint movements that fire up big muscle groups. They improve your grip, engage your abs, and help you sculpt an enviable V. But this classic reigns supreme ... and it may be the best arms exercise, too. The Best for Your Legs: Squats are one of the best exercises in the gym—period—but which variation is best? Front squats challenge the body differently than back squats. Goblet squats incorporate balance.Braced squats may be the ultimate exercise for your abs. But this grueling move is tops for your legs. The Best for Your Abs: Crunches are the most ubiquitous, but they're not the best. Planks—and these variations—will train your core stability and rip your abs from the inside out. But if you want the ultimate core-training challenge, grab a bar for this exercise. The Best for Your Heart: You gotta have heart ... which means, yes, you've got to do cardio. If you're going to hop on a machine, the rower is your best bet—use this guide to get your form right. You can do great things with intervals, but this cardio workout beats 'em all.