Your cousin needs to get his certification updated.

You press whatever you can feel comfortable with without putting too much stress on the knees and lower back.

Too late for me to pull out the basic certification books to directly quote the materials so you can see what the current guidelines are, but I will get them out soon and post what the accepted guidelines are.

What kind of personal fitness trainer certification does your cousin have, when did he get it, and how often does he attend conventions, which ones does he attend, and when did he attend his last convention?

Koffee