1) Don't do them at the start of the Piperinox Review workout.Unless you want to wipe yourself out and make your strength training less than optimal, don't start your workouts with the intervals.You'll get more results by doing your intervals at the end of the workout.2) Don't alternate between a strength training exercise and an interval.
If you do this, your strength work will suffer. Want to get 20% weaker in your lifts? Then just try to lift something after you have sprinted for 30-60 seconds. I guarantee you'll be a lot weaker if you do that...but that's the exact opposite effect of what you are trying to achieve with strength and interval training.We want to be fresh and strong for our strength training exercises, and then finish the workout with energy-depleting, turbulence-promoting interval training.