@prabakaran Do you do any aerobic or conditioning work now? Or have a background of aerobic/conditioning?
The program is conditioning as well as strength. Like a CrossFit WOD or strength bootcamp. Because you are cycling through different primary muscles you should be able to eventually do this at a fair clip.
But, when starting this program like this it may take time for the conditioning aspect to trigger your adaptation to it. That will take a few weeks to develop to a point where you notice it is easier, and may take 5-6 weeks before you can do a workout and not be breathless coming out of the 3rd set of squats.
You want to accelerate your conditioning tack this on to your work at the very end. 5 minutes, as many burpees as you can do. Increase the number each workout if possible. Rest if you need to during the 5 minutes but aim for as many burpees as possible. After a couple of weeks, you won't think the other stuff is hard. Once you find the rest of the workout is easy, stop this if you want.