You are downloading the Marathon XAP file v188.8.131.52 for Windows Phone. Marathon is a paid and useful Health & Fitness app: Marathon can record and save your movement, It's the perfect companion for sporting activities such as running and biking. Thanks to the announcement ... You can now download the offline XAP file to install & try it.
Download Locations for Marathon 184.108.40.206 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Marathon XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.