Tracking an exercise like the squat is easy (seeing as it's one motion), ie: weight [40kg] - sets  - reps .
But what about an exercise like the biceps curl. They can be done at the same time or one at a time. How would people prefer to track an exercise like that? Either:
- arms singularly => weight [14kg] - sets  - reps 
- arms together => weight [28kg] - sets  - reps 
Arms together, gives a total weight of 28kg, but you're still only engaging half of that (14kg) per arm, so I would have thought the first way of tracking (singularly) is the most accurate, thoughts?
I've discovered that a rep in each arm or leg only counts as 1 rep when you have completed both. Simply put, 10 biceps curls with your left arm and 10 with your right, is really just 10, not 20 reps.