In this day and age we rely on our smart phones for everything (literally everything) and since I don’t see that changing anytime soon, I think it is only fair that I give my best advice for using your phone as a major fitness tool.
Fitness apps have grown so immensely that you can download one for just about any type of fitness goal imaginable. The question is though, which one’s are actually worth downloading and which one’s are a waste of time (and possibly money)? Personally, I focus mostly on strength training in the weight room. There are a couple of apps that I have downloaded that are absolutely perfect for this and others that made me say “what was I thinking?”
The best apps I can recommend for people like me who are in the weight room all the time are called FitnessBuilder and BodySpace. I like FitnessBuilder because you can make up your own workouts, track how much weight your lifting, and see your progress as you start lifting more weight graphically. BodySpace is great because there are thousands of workouts and workout programs that others have designed and published that you can follow if you don’t want to make up one yourself.
If you are more into running and cycling, the amount of apps that are out there are so massive that I couldn’t list even a small fraction of them off the top of my head. My personal favorite for when I’m going on a run is Nike+ Running. It tracks how many miles you’ve ran, how long you’ve been running for, your average mile pace, and shows you a map of the route you took after you’ve finished. Others that I can recommend that work for running are MapMyFitness, Strava, Runtastic, and RunKeeper. Strava and MapMyFitness are both great for cycling as well as running.
The one kind of fitness app I don’t recommend at all for anyone is ab workout apps. They are all false advertising because they claim to train you to get great “six pack abs” when really that’s just nonsense. The way to get a six pack is with a healthy, well balanced, diet and exercise. Working your abs is important to keep your body strong and all that, but don’t follow any of these ridiculous apps please. They all contain exercises that are bad for you lower back and not worth doing unless you have a certified trainer there to check your form.