Plankstar: Plank workout timer

I downloaded this to start tracking planks I am starting today to try to loose my mom belly with DR. This says it connects to Apple Health so I downloaded this even with just one 5 star review. Well there are no notations on what is a premium feature BEFORE downloading the app. Turns out the one feature I got it for is a premium feature only. Seemed like a good app since I just wanted a timer that tracked what I did while reporting it to Apple Health and other apps I saw are preset. Off to find one that connects to Apple Health. Many give a trail run but not this one. Can’t see how well it works and connects to Apple Health without paying. I do not pay for things I do not know how they will be when it comes to apps and other things.