Old technology

This App has not been updated with newly available APIs in a looong time. Its stuck somewhere in iOS 8. It doesnt offer any of the basic health logging that is now common to other tracking apps, the main one being no integration with Health Kit. Also, user experience while entering data is horrible. You need multiple clicks to move between fields, set focus, or enter data.
BTWB, you need to hire some real developers.

Yarivk9 about btwb: WOD Tracking, v4.2.1