Monitoring how much we exercise (from simply walking around to full fletch fitness program) how much water we drink and what we eat can help us in getting fitter or staying fit.
These apps are designed to help you with it:
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RunKeeper

Set your personal goals and keep track of your running-achievements. Listen to music whilst training. Get motivated by a community of runners.  Whether you’re walking, running whether your a beginner or a professional the RunKeeper app is a nice companion for al your running activities.
For iOS
For Android

iDrated

Drinking water is essential for our wellbeing. Many of us however neglect it or have no clue of how much water intake we had.
This app will help you keeping track of our water consumption throughout the day. It allows you to set goals and will motivate you to reach them.
For iOS

7 Minute Workout Challenge 

Earlier we already posted about the scientific 7 minutes workout and showed a itunes movie and an infographic (see our blog-post). Now you can add also this app to it. No more excuses that we have no time to exercise. A 7 minute workout can always be squeezed in, even when your calendar is extremely busy.
For iOS
For Android

Full Fitness: Exercise Workout Trainer 


A very complete “Exercise Workout Trainer” with hundreds of different exercises explained with images and videos for the more complex ones.
Furthermore you can set your own goals, track your calorie intake with more than 90.000 food items, possibility to share your achievement with others  and much more.
For iOS

MyFitnessPal 

Knowing what your eating and keeping track of it can be an important part of your fitness program and can help in keeping or reducing weight. This app makes it very easy to keep track of your food intake. Simply enter the food by selecting from a vast library of different food items.
For iOS
For Android
For Windows

Yoga Studio 

Yoga may be an interesting addition to your fitness program.
Take your Yoga studio with you. This app offers you 65 Yoga Classes and shows the various poses. Select your level, duration and focus (strength, flexibility, relaxation, balance or combination) and find classes that match these selections.
For iOS

5k Runner 

Their claim: “Get in shape in 8 weeks with the official and often imitated 5K Runner® 0 to 5K program. This app has over 4.2 million success stories of people that got in shape and started living healthy, and you can do it too. Only 30 mins, 3 times a week, for 8 weeks and you will run 5K.”
For iOS

Zombies, Run! 

This app offer you an interesting push to keep running. Whether you’re a beginner or an expert, it works at any speed. The app immerses you in an action packed game.
If you want to do some serious workout the app can force you to speed up to escape the hordes of zombies that are chasing you.

For iOS
For Android

Smoke Free 

Giving up on smoking can be very hard. This app may help you to quit. It tracks your achievements and give visual feedback on how your health might improve the money you save.
It might be just the incentive you need to achieve your goals?
For iOS
For Android

MyPlate Calorie Tracker 

Their claim: “Everything You Need to Loose Weight in One Place”: Calorie tracker, workout program, daily motivations and tips, personalized meal plans from an nutritionist, charts, goals, communication support,…
For iOS
For Android

List Source: Decibel
Content source: respective websites and app descriptions