1. Save time: train more than 1 body part at the same time
2. Less equipment: all you need is a set of dumbbells
3. Save space: you only need a couple of feet of space
4. Versatile: use your creativity to train almost any muscle group
Besides the above benefits, I've also found the dumbbell combos are great to work with small groups and teams. You can have you athletes stand in a circle so you can watch them all together.
Try these combination lifts in order for 6-8 reps.
45 DEGREE LUNGE
ANGLED PRESS SHOULDER PRESS