Sorry I don't have any studies to quote, but here is some information I 
have gleaned. As a figure skater, I was anxious to be back "on the ice" 
after my daughter was born. I had skated regularly throughout the 
pregnancy and resumed 3 weeks postpartum with blessing from my midwife. 
The only cautionary is that weight loss can be quite rapid. Mother should 
make sure she is not restricting calories too much while exercising. The 
calories used for nursing, coupled with moderate exercise results in 
weight loss without extra effort at "dieting". Encourage athlete moms to 
eat small, nutritious and regular meals. I once read an article about 
distance runners (or triathletes) whose babies did not nurse as 
enthusiastically after a work- out, but came back to normal behavior by 
the next feeding. In other athlete moms that I know, breast refusal or 
baby behavior change after working out did not seem to be an issue. Milk 
supply is based on baby's demand, so if mother is not using ABM 
supplements or pacifiers to artifically stretch out the time between 
feedings in order to work out, milk supply should be fine. I hope this 
unscientific info. is helpful. Please also remember, breastfeeding is how 
humans have been designed to feed their babies for eons, and only recently 
have we become so sedentary.

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