No, the strike zone in Baseball is defined as the area over home plate that extends from the midpoint of the batter's torso (around the waist) to the top of the knees when the batter is in their natural stance. This means the strike zone varies depending on the height of the batter. Umpires visually determine whether a pitch crosses through this zone to call it a strike or a ball.
between your knees and waist.
No not normally
lifting the knees to waist lineIt is "goose step" marching.
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.
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.
Joints below the waist include hips, knees, ankles, and sacroiliac joints. These joints provide stability and support for movements involving the lower body.
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.
To properly lift heavy objects and prevent injury, it is important to bend at the knees and not at the waist. This technique helps to protect your back and reduce strain on your muscles. Remember to keep the object close to your body and use your leg muscles to lift, rather than relying on your back.
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.