Weight rather than distance makes no sense. Please fix the workouts builder on the app.
Can you please provide more detail? Is this in regard to a Connect IQ app, and if so, which one?
Please review https://forums.garmin.com/developer/connect-iq/w/wiki/5/bug-reports-faq#new-report to see the information we need for an actionable bug report. In addition, if this issue is not related to a Connect IQ app or Connect IQ bug, the issue should be reported to the forum associated with your product: