Resting man --> not a gerund. Adjective.
Gerund: My favorite activity is resting. GERUND! Not a Gerund: My swimming coach was eaten by a shark. NOT A GERUND! Gerund: Many Koreans enjoy swimming. GERUND! Try better, guys.
I know, I know, it is in beta.
Please reference my email to you about including grammar references in a bibliography page. If you are not using standard references to build this course, you should be. And if you are, you should document them towards the user: give credit where credit is due & improve (and prove) the rigor of the course. Thanks!