Two options /k/.
You are transported back to the Roman Empire, you must survive as a new Gladiator for one year in the Colosseum. Nothing but your Patron forces you to fight, it is possible to influence them to pit you less, however, if you do not complete 300 fights, you will never return. You can understand any language as though it is your native tongue. You acquire an ancient Roman physiology and a physically fit.
You are transported back to the Roman Empire, you must survive for five years as a new Gladiator in the Colosseum if you lose, you will never return. You can not understand any language unless it is Celtic spoken by a Britanian. You keep your physiology and fitness.
Why the fuck wouldn't I fight to the death with my barbarian Celtic kinsmen?
What do you not know of physiology?
Assuming modern Germanic genetics, you'll be a great deal taller than most combatants and have had access to modern fitness techniques and supplements. You could theoretically whack-a-mole your way to freedom.
and you're fucking stupid if you think that being a little taller and bigger than someone means you'll automatically win a fight against them, especially if they're gladiators that have experience fighting in the arena and you're just some schmuck who knows how to use weapons that exist over two millenia in the future.
I don't remember who said it, but I recall someone knowledgeable once saying a good big man will always beat a good small man. So there's that. But frankly I imagine a man who's survived more than a few fights in the arena would beat almost anyone except like operator tier and higher hands down
Hardship+old medicine does not produce exceptional warriors. It produces hardcore bastards with trick knees, bad backs, and bone fragment-ridden tendons.
My fat body would still get fucked though.
When you put it that way yes.
Only probably with pilum wounds and FUCKED up organs. I know it probably looks like I'm grasping for straws, but I really doubt warriors of antiquity are even in as good a shape as infantry today, unless you compare them to like, South African infantry, or some other country that sucks but still sees action.