Drill 
To dream of a drill suggests that you are moving toward a novel course in your life. You are accepting new opportunities and thoughts.
Aerobics
Dreaming of aerobics, whether you are either actively participating or observing, symbolizes a need for greater flexibility in your waking life. You may not want to be restricted or limited in your actions.
It could also indicate a desire for greater physical involvement in a project.
Rehearsal
To dream that you are attending a rehearsal suggests that you are preparing yourself to deal with the realities of the outside world.
Jackhammer
To dream of a jackhammer implies that some situation or issue needs to undergo a major alteration. You should update your beliefs, ideals, and behavior.
- 1