You don't have use that much lighter weights. You can do a 5x5 and superset it with burpees or opposing muscles. I'm on a pull-up kick where I want to do 500 pu

You don't have use that much lighter weights. You can do a 5x5 and superset it with burpees or opposing muscles. I'm on a pull-up kick where I want to do 500 pull-ups over the course of a single workout. So in between sets of my regular workouts, I do pull ups. HIIT basically happens as a side effect...