Chapter Two, The Breath, discusses breathing, breath support, relaxation, air compression, blowing exercises, the diaphragm, the lungs, inhaling and exhaling air, circular breathing, the relaxed throat, the glottis, warm-up exercises and excessive tension.
Really low sagging, like practically with your pants at your kneecaps is not in style right now, but sagging to show a little underwear, or the more PC term low rise is still in. Sagging is purely a thug influenced thing, dudes do this look like wannabe thugs that lost their belts in prison. I won't even lie.
If you roll the hem of the bootcut jeans up to your knee, you will see that the hem is an inch or so wider than the knee. Bootcut jeans being tight on thighs mean they are unsuitable for official purposes, and this is also why they are not seen in offices.