Sometimes there’s a lot of pressure to always turn out a ‘proper’ drawing but I don’t think that’s what sketchbooks are for. Artists need to practice, just as musicians do and my sketchbook is, for me, a great way to practice. Speed drawing helps to hone skills, forcing you to focus on what’s absolutley vital in the subject. I scribbled this in about a minute earleir today when I was having a pub lunch. The father and his little girl were at the bar and I had to work quickly to catch something as the child was excited and rushing around. I used a ballpoint pen into my A6 sketchbook.
scribblah 
Nothing like gesture drawing a moving subject to get your eye-hand coordination tuned up!
Oh it certainly does 😀