As already mentioned exercises are simple and can be done at home with a pair of dumbells , Here the emphasis is to keep fit without going to a gym and for people who have less time and want to finish it off fast . These are basic exercises and can keep you fit like you do with any complicated movements. As the internet grows and various modes of variations in exercise unfold no one is concerned with the load and injury they put on your spine and other joints of your body. Every video is pushing one to the wall with strenuous exercises which in turn do not take into account your age , pre ailments , your exposure to training and the like thus causing long time injury from where you can not get back your original form. GO slow go steady dont hurry into any exercises if it is giving you pain. The body tells you as and when you get acclimatized.