It's possible you are qualified. But that's not the issue. The issue is credibility. You haven't established it yet. There are as many ways to bench press as flavours of ice cream.

For the sake of humanity and good karma, I'd try to advise them once. If the reception is good, obviously it makes sense to go further. But if the reception is cold, I'd leave them alone.

You guys make me glad I work out at home.

"Wah lau eh, my best friend used to squat exactly like you man! Gawd, the memories. So he was doing it like you, when one day he collapsed under the weight! He severed both quadriceps, destroyed both knees, his damn cun girlfriend is now mine, and he is a cripple in a wheelchair."