One of the perks my wife has is I design her training program every month. 

In her most recent program, she requested one of her workouts be shorter than normal...

So, I definitely inserted this:

#1 exercise that only needs 5 reps per set

There you'll see why it's only 5 reps (I walk you through the exercise). 

And you'll see how I made it to where you don't even need equipment.

The exercise was created by Todd Durkin and I still use it with my clients to this day (with modifications of course). 

I challenge you to do this move (70-second tutorial) after your next workout as your cardio. You can skip the treadmill. :) 

Talk to you later,

Mikey