Workouts Worthy of "Selling" as a Trainer

[KingJustin]

So I decided to be a trainer.

I have shadowed a couple of the "head" trainers, and when they are trying to sell services, they take a client through a grueling session. Usually 50 sets of the same muscle groups, all 15 reps, every set taken to failure, with no rest in between. They do this not strictly to sell a routine--they think it works.

I have a little more integrity than to do that. So, I was trying to think of good workouts to give people to make them feel like "oh **** yoz I gots a mad good session" while at the same time delivering something that is actually going to help someone build muscle/lose fat/increase strength, etc.

I don't really buy into failure training (with a few exceptions), so I'm looking for some stuff that is going to leave someone exhausted and fatigued, but without doing just pump training.

My plan was:
Warm-Up - Dynamic stuff
Strength/Weights - (?????)
Cardio - Complexes
Cool Down - 5 minute Walk/Jog/Elliptical
Stretches

Any ideas for weight stuff to keep someone moving a bit and make it EXCITING?