World's Fittest App, developed by Hearst Magazines UK, is a free lifestyle application available for Android users. This app is designed to help individuals unlock true functional fitness, regardless of their fitness level. The app offers four 12-week training plans, each designed by adventurer-athlete Ross Edgley. The plans include simple moves using basic equipment and are grounded on sports science to make users fitter, leaner, stronger, and faster.

The app offers four different training plans, including Big & Strong, Lean & Ripped, Fit & Fast, and Speed & Power. Each plan comes with clear video guides for each movement, so users can focus on getting fitter from the first rep. The app also offers support when users need it, with every session and exercise at their fingertips when they are working out.

Train like Ross Edgley, the record-setting adventure athlete, and transform your body into an instrument, not an ornament. Each plan is founded upon his academic knowledge, extraordinary experience, and best-selling book, The World's Fittest Book.

Overall, World's Fittest App is a great option for those looking to improve their functional fitness and take their training to the next level.