After having a baby it can be tough to get back into an old fitness routine, and even tougher to start a new one.  Your body and mind have been through a lot and you need to give them time to heal.

It may not always feel like it, but exercise in what ever form you choose, may be the perfect way to boost your energy.
You may be doing it for the physical reasons but the mental side is just as important. 
Exercise can prevent or aid the recovery from post natal depression and if nothing else, can give you a little break from the baby mayhem to focus on yourself.