There are a few easy methods to stream the app on your phone or tablet to your TV!
1) AirPlay to Apple TV
My Fitness can be streamed to your Apple TV (swipe up to your control center to find the Screen Mirroring option) or another AirPlay enabled device. Here is a link to view instructions on how to AirPlay and Mirror the app from your phone or tablet to your Apple TV with one click of a button: https://support.apple.com/en-us/HT204289
2) For newer Android devices, swipe down from the top of your screen to find the Cast button which will allow you to stream directly to your TV. For older devices, you'll need to install an app called Google Home to stream it. You can find instructions for that here: https://support.google.com/chromecast/answer/6059461?hl=en Or, you can download this highly rated app for streaming: https://play.google.com/store/apps/details?id=com.mobzapp.screenstream.trial&hl=en#details-reviews
3) Lightning to HDMI Adaptor Cable
You can purchase an lightning to HDMI adaptor cable (see picture below) for your Apple or Android phone that connects to your TV's HDMI cable. These are available from various retailers such as Amazon.