Do what you can handle, even if it's only 10 to 15 minutes, and increase your time as your endurance improves. As you walk, don't overstride, and let your arms swing naturally by your sides. Fit exercise into your new schedule. The key is finding an activity that meshes with your schedule and lifestyle. Check out your local health clubs, YWCA or yoga studios.
Many clubs offer postpartum exercise classes where babies are welcome.
Build a library of postnatal exercise videos, which can be a more convenient way to squeeze exercise into your day. Take a hike with your baby and friends. Consider investing in some home exercise equipment, such as a treadmill or recumbent stationary bike. A good machine, set up in a convenient spot in your house, may inspire you to work out during mornings, nap times or evenings. And it's handier when you can't find a sitter.