using equipment that you haven't been trained on a. is ok as long as you're careful and read the directions. b. allows you the o
pportunity to teach yourself how to do a particular exercise. c. can cause major damage to your body and to the equipment. d. is a good way to add variety to your workout.
By "equipment" here, I would assume that you are talking about gym equipment. While it is safe to try out a new equipment for as long as you practice caution and follow the instructions (a), it can probably damage your body in the end especially if you are following a weight program. If you are not careful, you might also damage the equipment and not just your body. So, in this case, I would say (c).
Citizen journalism is essentially normal journalism, except most information used to write it is typically derived from other media like proffessional journalism.