"What, You never seen a muscular Lombax before? Its all thanks to some experimental nanites that have allowed me to get this big, which is perfect for the heavy lifting and whatnot I tend to do with junk and machinery around here. And don't worry, the nanites are perfectly safe."
This was done as a request by my very good friend  FluffyBastard here on FA, I also have my longtime friend  Densjin to thank for getting me really interested in the Lombaxes, have been playing the Ratchet & Clank games for years but never really thought about myself as one.