What are the best ways to get big muscles without having to do any exercises at all?

Daily activities: Make your daily activities more difficult - take the stairs, park further away, bike/ walk to work/ store, sit on a swiss ball/ at your desk and stand up every time you answer the phone, or lunge/ hop/ jump from place to place in your house. Things like these may seem small and silly, but the increased calorie burn can add up over time. Don't forget a healthy diet!