Awesome app but caught in update loop

This app is fantastic for keeping a consistent strength training schedule. I did a 12 week gym program that kept me going to the gym through the winter. It was exciting to watch the increase in weight and feel stronger. Most recently, when I open the app, it provides a button to update, which takes me to iTunes App Store & theres only an "Open" button which takes me to the app & the update message. No way to get around it. Help!

Bingo baby! about Spitfire Athlete Weight Lifting App & Workout Plan