[JetMetFan]

Here's the NFHS definition of guarding:

Guarding is the act of legally placing the body in the path of an offensive opponent. There is no minimum distance required between the guard and opponent, but the maximum is 6 feet when closely guarded. Every player is entitled to a spot on the playing court provided such player gets there first without *illegally contacting an opponent. A player who extends an arm, shoulder, hip or leg into the path of an opponent is not considered to have a legal position if contact occurs.

Here's the NFHS definition of how you obtain legal guarding position:

To obtain an initial legal guarding position:
a. The guard must have both feet touching the playing court.
b. The front of the guard's torso must be facing the opponent.

Here's the NFHS definition of how you maintain legal guarding position:

After the initial legal guarding position is obtained:
a. The guard may have one or both feet on the playing court or be airborne, provided he/she has inbound status.
b. The guard is not required to continue facing the opponent.
c. The guard may move laterally or obliquely to maintain position, provided it is not toward the opponent when contact occurs.
d. The guard may raise hands or jump within his/her own vertical plane.
e. The guard may turn or duck to absorb the shock of imminent contact.

The criteria are essentially the same under the NCAA and NBA rule set. Look at these and determine whether what you're doing violates any of them. If so, then you're committing a foul.