GymGoal ABC for iPhone, 99 cents A body map of muscles lets you choose where you need toning help and suggests a move—from more than 280 animated exercises—designed to target that muscle group.
FitDeck for iPhone and BlackBerry, $9.99 This quirky app is based on the FitDeck game—a deck of cards with each card displaying a different strength-training move. (Think classics like pushups and WTFs like bear crawls.)
FitnessBuilder for iPhone, $9.99 Dozens of routines and individual exercises are customizable by venue (hotel room, gym) and fitness goal (abs, flexibility) and include video tutorials. Track your progress with tools like the exercise log and BMI calculator.