The Federal Fitness Credit and many of the equivalent provincial credits were discontinued starting in 2017. 

• But If you live in MB, QC or the Yukon, you'll enter your activity amounts in the Dependant credit section. 
• Once the Profile Section of your return has been completed; select Deductions > Claims for Dependants.

For more information - TaxTips - Line 365 Federal Children's Fitness Amount Tax Credit - https://bit.ly/2Xkyal7