Include more examples of exercises and group activities

[pedrohbraga]

• Include one additional example for each of the current exercise categories;
• If possible, include other examples of exercise categories (see Resources below);
• Perform necessary and equivalent changes in the other language.

Suggested Resources:

• https://iase-web.org/documents/SERJ/SERJ16(2)_McLaughlin.pdf?1512143380
• https://www2.ed.gov/rschstat/eval/tech/evidence-based-practices/finalreport.pdf
• https://www.saltise.ca/resources/online-teaching-learning-resources/helpful-resources/
• https://journals.plos.org/ploscompbiol/article?id=10.1371/journal.pcbi.1006023#sec006

Important: only close issue after issue has been resolved in both languages