Strength and stamina exercises

I have had a few issues with muscle fatigue at the end of my workouts so i did some research and found a great new exercises routine.
I read in a magazine recently and decided to try this 15 minute workout prior to my regular 1 hour lift regiment. These 3 exercises are designed to build muscle stamina and also great to add to any circuit training routine. When i am at the gym I am looking for a new exercise as much as I can, so when I read about these three and tried them out i wanted to share and also explain how they work and how you can add them into your every day workout.

First off the way these exercises are done is what is called pyramid repetitions. The was this works is: do 1 rep of each exercise then do 2 reps of each 4 reps of each and then 5 reps and then back down to 1. Do not take a break do this continues and move from exercise to exercise for 15 minutes.


Exercises:

Boxers punch + dumbbell squat:
Use a 5 pound dumbbell in each hand, throw 32 punches alternating left and right. Then drop your arms at your side and get into a dumbbell squat position. Bend at your knees until your thighs are parallel to the floor and then press up. Do 16 squats...
That's 1 rep !!!

Push up + prone row:
Place 2 six sided dumbbells on the floor and grip them for doing a push up. (lower in 2 secs and burst up in 1). When in the up position bring your hand up to your arm pit, as if doing a bent over row on a bench. Lower the weight down and do it on the other side. Do 5 of those.
That's 1 Rep!!!

Jump Squat + Curl:
Get in the squat position as you hold dumbbells at your side. Explode up quickly, land softly on your feet and sink back to your heels. Then once set do a double curl with the both arms. Take one second to raise the dumbbell and 2 seconds to lower it. Do this 5 times.
That's 1 rep!!!

So that sequence of exercises is one total circuit, do that each time increasing the reps, try to get to 5 and go back down, do this for 15 minutes.

I would do these exercises for a warm up to a leg and arm and back day, or just do these for a warm up for a cardio day. Let me know what you think and i will keep you posted on any new exercises i come up with.