Orcs and Nords are going to be your best bet, because they're already meaty races.
You can play around with the sliders to your heart's content for the best appearance though.
PC NA CP 531+ Aedric Fury Sits Around Doing Nothing Sola Auroron Magicka Templar Lunaria Chimeri Magicka Dragonknight The Chosen of the Storm Stamina Sorcerer Ward-Scales Magicka Nightblade Sanctius Luxen Stamina Templar Nerwaye Auroron Magicka Sorcerer Warden Vyrkyl Stamina Dragonknight The Ninth Adventurer Stamina Nightblade Magna-Sola Magicka Templar The Celestial Lady Magicka Templar
Read their adventures! The Celestial Lady
My male Nord has a bit of a belly and some extra junk in the trunk, but not much.
"Bah... This is not the way... "
PC EU Tempora Jof, Daggerfall Covenant, Breton, Sorcerer, Vampire: "Being good is hard..."
Jurfi da Nord, Aldmeri Dominion, Nord,Warden, Vampire: "Serving my own needs is easy."
Randal the Second, Ebonheart Pact, Dark Elf, Dragonknight: "I refuse to feel the ex-slaver guilt I have."
Inos sal'Ma'Nefic, Aldmeri Dominion, Imperial, Templar: "Heals by accident count, eh? Eh?"
Desdenada Jof, Ebonheart Pact, High Elf, Sorcerer: "Righteousness is its own edict."
Joffi da Rat, Aldmeri Dominion, Wood Elf, Nightblade: "Bah, this is not the way..."
Indigo sal'Ma'Nefic, Daggerfall Covenant, Redguard, Dragonknight: "For glory!"