You've decided you want to lose weight or build lean muscle. That's great! Now grab your smartphone. It's a valuable asset that can help you achieve your physical fitness goals, whether to improve your health or enhance your appearance, and I'm going to show you how. Numerous apps for your iPhone or Android phone can help you record and monitor the metrics contributing to weight loss and muscle gain. And while wearables from Apple, Samsung, Fitbit, Garmin, and others provide workout tracking from your wrist, you really only need your smartphone for all your fitness tracking. Bear in mind... more