
Well, clearly MENTAL tasks are not enough.
The Big Bang Theory Season 10, Episode 22

I forget, which MENTAL hospital
are you guys registered at?
The Big Bang Theory Season 11, Episode 10

...of arm wrestling with the MENTAL agility
of Tetris into the ultimate sport.
The Big Bang Theory Season 1, Episode 16

Then as a MENTAL exercise,
I invite you to figure out...
The Big Bang Theory Season 4, Episode 22

who don't have MENTAL problems.
The Big Bang Theory Season 9, Episode 10