eg, language classes, exercise, baking, dance classes, cleaning, playing a board game, etc.

If referring to exercise, you might see “outdoor” activities, which would be outdoor sports, like jogging, swimming, basketball, etc…

An activity is usually a short term project that keeps you busy. Workshops or school usually involve planned sequnces of activity.

From wikipedia:

Activity may mean:

action, in general

Activity, an alternative name for the game charades

Activity, a task.

Activity, the ability of a piece to influence the game in chess

Activity, the rate of a catalytic reaction, such as enzyme activity, in physical chemistry and enzymology

activity (chemistry), the effective concentration of a solute for the purposes of mass action

activity (project management)

activity (radioactivity), the number of disintegrations per second

activity (software engineering)

activity (soil mechanics)

activity diagram, a diagram representing activities in UML

HMS Activity, an aircraft carrier of the Royal Navy