"Are there women who can beat men at arm wrestling" is a very different question than "are there women I can session with who can beat me in arm wrestling."
The answer to the first is unquestionably yes. A professional female arm wrestler is going to beat most 'average' men, I'm sure. A female bodybuilder can probably beat an 'scrawny' guy, but will most likely loose to a guy who also spends time in the gym.
Only you can answer the second.