New parents can make extra cash while getting in some exercise by picking up an active side gig like dog walking. Not only can you make money while burning calories, but also you also get the emotional and psychological benefits of being around dogs and spending time outdoors. 

Among the many things, parents wish they knew about before raising kids includes the unexpected costs and the weight gain. As Lifehacker contributor Melanie Pinola observes, even the dads have to struggle with their bodies growing larger after having kids.