Fouls are similar between the two games. The ball cannot hit your feet. Third-party is a foul. You can’t lift at someone’s body unless they’re in front of the goal. The ball has to move a specific distance before going into the circle. No hacking.
The largest change is that there is no lifting indoor except on goal. In outdoor, you can “pop” the ball or lift it above someone’s stick to go around them, but not indoor. Penalty corners are also played somewhat differently.
In both outdoor and indoor corners, no one can enter the circle until the ball is inserted and the ball has to come out of the circle and brought back in for a goal to count. In outdoor, the defense can only have four players back while the rest of the team is at the 50-yard line.
The offense can have as many players on the circle as they’d like. With corners for the indoor game, the defense is allowed to have as many players back as they’d like. The offense can have as many lined around the circle as they’d like.
The goal cages are similar sizes. Several of the fouls are the same. The protective equipment is alike. Though the most important thing is it is all fun. Basically, indoor hockey is the same as outdoor field hockey, but on a smaller field. The game is quicker, much smaller, and more controlled due to the limited space and the chance to rebound the ball off the sideboards.
The game is known to enhance a player’s vision on the field and stick handling skills. If you’ve been playing outdoor field hockey, your skills can simply transfer over to indoor hockey. All you have to do is practice the basics skills.