The biggest benefit to pairing exercises is time efficiency that’s why I like to superset or tri-set exercises. .
Supersets: Completing two exercises back to back with little to no rest.
Tri-sets: Completing three exercises back to back with little to no rest.
Here is a tri set I like to use to work the shoulders, arms and core:
20 Ball Slams
20 Push Ups
20 sec Plank
All performed back to back then a short rest before starting again.
Complete 4 full rounds and you will begin to understand how effective pairing exercises is.
Give it a go!