What can I do if I dont have time to perform all 1st stage exercises at home, or if somebody interrupts me in the middle of exercise?
I do not have enough time too and usually I do a part of exercises complex at home, and a part I do in transport. If somebody interrupts you during exercise take it easy. Check all exercises in complex. Probably some of them are not necessary anymore and you can decrease their duration. Also possible, the situation is opposite and then you need to find extra fifteen minutes for yourselves. Everything depends on you!