For athletes, it’s training and focus 100% of the time. Every decision, purchase or idea made has something to do with staying in tiptop shape. If you’re an athlete or training to be a pro, you have a secret exercise weapon with you all the time: your smartphone!

There are tons of fitness apps you can use to help keep you motivated. From monitoring your runs to pushing you to train harder, fitness apps are every athletes ace in the hole to be constantly on top of the game. Based on experts who sell cell phones, here is a list of the most used fitness apps for both iOS and Android devices.

• Nike Training Club

Just like having a personal trainer with you all the time, Nike Training Club features over 60 workouts which range from 15-minute toners to 1-hour long sweat sessions. All routines concentrate on every muscle in your body. The more you use the app, the higher the "rewards points" you’ll get, such as the complete workout routines from pro athletes and celebrity fitness trainers.

Available on: Android and iOS

Price: Free

• BodySpace App by Bodybuilding.com

Using the Bodybuilding.com mobile fitness app means having access to BodySpace from your Android gadget. The app features motivational fitness photos, lets you track your progress, and allows you to network with other members to achieve and surpass their fitness goals.

BodySpace provides you with instant access to hundreds of workout videos and fitness routines you can do on your own or with a trainer. Note that you need to register for a BodySpace account to use the app.

Available on: Android

Price: Free

• Runtastic Running and Fitness App

Runtastic works with a GPS program to map and monitor your sports and fitness activities like running, biking or walking. The app tracks your cardio exercise progress to help you achieve your training goals. The Runtastic community also offers fun and inspirational routines to improve your health and develop your endurance. The app is a great fit for pro and amateur athletes.

Available on: iOS and Android

Price: Free

• FitStar Personal Trainer

With High-Def video instruction from former NFL star Tony Gonzalez, the FitStar Personal Trainer app develops personalized routines that line up with your personal fitness goal. The app enables users to type in feedback and regularly shifts routines depending on how good you perform them.

Available on: iOS and Android

Price: Free with a choice of a Premium upgrade

With these fitness apps, you can stun your sports coach with improved endurance and boosted energy levels.