To connect your Apple Watch to the fitness app on your iPhone, you need to follow these steps: 1. Go to Settings. 2. Tap on Privacy. 3. Click on Motion and Fitness. 4. Turn on the toggles for Fitness Tracking and Health. Now, go to the Watch app on your iPhone and follow these steps: 1. Go to My Watch. 2. Click on Privacy 3. Turn on the Fitness tracking and Heart rate toggles.