As @The_Mighty_Stu said, drop sets are a great tool to get volume in without all the time straight sets take.
For me, I prefer doing supersets or giant sets. That way, I can do three exercise-sequences, three sets/rounds each and be done. It’s also more cardiovascular intensive, so it gives you a good sweat and makes you feel as though you’re wroking. Plus, it requires more work in a shorter time than you might be used to which causes adaptation in a different way. Here’s some examples of what I like to do with supersets/giant sets:
- Arnold Press, Lateral Raises, Bent-Over Rear Delt Lateral Raises (all dumbbell based)
- Front Raises, Upright Rows, Bent-Over Rear Delt Rows (all barbell based)
- Skull-Crushers, Close-Grip Bench w/ same weight, Barbell Curls (all barbell based)
- Bench Dips, Close-Grip Pushups, Curl variation
- Flyes, Presses (dumbbells)
- Presses, Pushups (although, you could just do dropsets on the presses)
- Pulldowns, Reverse-Grip Pulldowns/Pullups, Chinups
- Reverse-Grip Bent-Over Rows, Bent-Over Rows or vice-versa
- Squats, Romanian Deadlifts
- Lunges with right leg forward, lunges with left left forward, stiff legged deadlift with right leg only, stiff legged deadlift with right leg only
Obviously, combining back and chest onto the same day and supersetting those two is also a time saver and an awesome pump.
Whatever…I think I exhausted my own point.