Complexes are great for building athleticism, burning fat, etc. so I like to use them a lot. Occasionally I will string together a few stability exercises in a complex and slow things down instead of rushing through it as fast and as powerfully as possible. Here is one simple option for you in a video below. Instead of a regular press, try something like a bottoms up press or a hand to hand press. Instead of regular push ups, try a one arm plank between each push up rep. Little things make a big difference in some peoples training because they might be in too much of a rush, and lack the tension necessary to build a stronger, more stable body.