How can I see how high I jump ? i;

(nooby question)

Type /am 1
To take the measurer off, type /am 0

am stands for altimeter.

That works for the highest point, if you want the altitude of any lower part of your body, open the replay in notepad. Then check at the right time the value of POS;. This is where it gets complicated. You see a lot of numbers. They stand for the x,y and z value of each joint. So when you want to see the height of the neck ( first joint) see the third value. The order of joints is this
( Source: Skjef )
0 = neck
1 = chest
2 = lumbar
3 = abs
4 = right pec
5 = right shoulder
6 = right elbow
7 = left pec
8 = left shoulder
9 = left elbow
10 = right wrist
11 = left wrist
12 = right glute
13 = left glute
14 = right hip
15 = left hip
16 = right knee
17 = left knee
18 = right ankle
19 = left ankle