Whenever a young man breaks a record at the Texas Baseball Ranch, I will as a habit, make the comment... "Wow... just think, if you can improve that much every week, by the time you are X (typically I add 10 years to their current age) you'll throw it 132 mph... and that'll be a record!"
Everyone laughs. But my point is made. Big jumps in velocity or bat speed, while nice, can't be expected every single week or month. While we all know that intellectually... emotionally we just can't seem to get our head around a plateau. We just assume we must improve from yesterday and give it no more thought than that.