This OSX update came with some surprises, and we have some work to do in order to get things up and running properly. I just spoke with one of our engineers and he had this to say:
The Mac app may have issues running on OSX 10.15 (Catalina) until some changes are made to meet Apple’s new security requirements in OSX 10.15. It will take me a day or two to figure out the new process and get it integrated into the production builds.
We’re really sorry for the inconvenience this has caused, we absolutely hate when technical issues keep our users from doing their workouts. Our engineers are making this a high priority issue until any kinks are ironed out.
If we find any workarounds we will post them here ASAP. Until then, using another device such as a phone, tablet, or another laptop will be your best option.