Couple months later

Mom: "John can you come here"

Mom once again asked me downstairs, but it's not yet time for dinner what she wants to tell me? I went downstairs.

John: "What is it mom?"

Mom came forth wearing gym clothes. I was stunned by what I saw. Mom had clear definition in her arms and shoulders. I looked down on mom's belly. She now had abs and quite impressive ones.

Mom: "Well?"

I looked as mom turned around showing her back. Though mom was not yet bodybuilder by any means I realized that within two months mom had catched me up. What took years from me only took couple months from my mom.

John: "Mom you have gotten fit. You have already catch up with me"

Mom smiled

Mom: "You are sweet but like I said I want to be bodybuilder. So I am nowhere as big as I intend to become. Since you are here wanna test me?"

John: "What you mean?"

Mom got her arm on table.

Mom: "It's been ages since I got to armwrestle with my son"

I felt a nice tingling sensation on my cock. It's first time my own mom made me feel even a slight arousal. I got my arm on table aswell. We got hands together.

Mom: "Ready John? On 1. 3 2 1 go"

We started. I was shocked of how strong mom was. Last time I armwrestled mom was when I was a teen and even then winning mom was very easy she was no real challenge. But now I had hardtime getting her arm down.

John: "Mom you have gotten quite strong"

Mom: "John you flattering me. You are quite strong too"

But eventually I slowly managed to move mom's arm and won. Though I won and mom is not yet as strong as me, already mom was easily the strongest woman I have armwrestled.

I let go.

Mom: "Looks like you won. Now next time we armwrestle you might not win. Next time I will be bigger"

John: "Mom we could go for rematch tomorrow or now even"

Mom smiled

Mom: "I did not know you find armwrestling fun. Can you wait until I have gotten bigger?"

John: "Yeah of course"

Mom: "Good. I hope you are excited for our future rematch"