Exertion in carrying a single heavy load, vs. many light-load trips: Shabbat 127a
Exertion to create a greater Yom Tov celebration: Beitzah 9b
Forbidding moving certain utensils because one might change his mind and decide not to use them, after having moved them [chayyish l'imluchei]: Beitzah 11a-b
Specific Cases
Walking in a weekday manner: Shabbat 113a-b
Washing dishes: Shabbat 118a
Moving a ladder from one part of a dovecote to another: Beitzah 9b
Taking an animal out of a pit: Shabbat 117b, 124a
Using trickery to remove an animal from a pit: Shabbat 117b, 124a
Drawing water: Shabbat 148a
Straining in Skinning an animal as one does for business purposes: Temurah 24a