How do I use my strength?

I'm gonna make this quick, my dad and I were arm wrestling and he said I'm strong but I don't feel the strength, being the contradiction pointer I am I asked where did he get im strong from if he didn't feel my strength, he said he feels and but he also doesn't feel it it's weird, he followed up with I don't think you know how to use your strength, well how do I use my strength?