Mike Trees on Instagram: "RUN FAST SOMETIMES, BUT SLOW RUNNING DOES THE REAL WORK TIPS 1. Run your easy days with someone slower than you. It forces the right pace. 2. You should be able to hold a conversation the whole way. If you can’t talk, you’re going too hard. 3. When you finish, you should feel like you could easily keep going. WHY THIS WORKS Slow running builds your aerobic engine. It’s the stress that triggers mitochondrial growth. More mitochondria means more places inside your muscle