text: const router = require('express').Router();
  
  router.get('/', (req, res) => {
      res.render('index.html')
  });
  
  router.get('/stats', (req, res) => {
      res.render('stats.html');
  });
  
  router.get('/exercise', (req, res) => {
      res.render('exercise.html')
  });
  
  module.exports = router;