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between your knees and waist.
No not normally
most likely it means that a pitch is up in the strikezone (around the letters of the jersey of the batter) or low in the strikezone (around the knees of the batter). (john here) I don't know why but major league umpires tend to call a lot of pitches high when they are actually still in the upper part of the strike zone. It also refers to short "at bats" as in three up, three down.
lifting the knees to waist lineIt is "goose step" marching.
this is called a bubble effect
It all depends on your umpire and the age group. The umpire gets to pick how large or small the strikezone is. As the ages get older however the strikezones seem to get smaller.
grab the opponents legs and hoist them up so that there waist is on your shoulders slam them down landing on your knees
It means to bend at the waist and lower your head toward your knees - think of the position when you have a stomach-ache.
There is the bicep which is in front of your arm and it is exercised by pulling something up from your waist to your chest. The one on the back side is the tricep, and it is exercised by pushing something down from your waist to your knees.
You should not bend down at the waist and lift up a heavy parcel using your back muscles. Always bend down at the knees, keep your back straight, and lift using your leg muscles.
Football players run a lot which puts a lot of pressure on their knees and ankles. They also get tackled by their knees which is also very serious. Football players may also have people fall on their knees which can cause injury.
Never bend from the waist. Instead, bend your knees and stoop; lift with your thighs and legs, keeping the load close to your body.