One way to organize training is by your distanse from opponent.
Save distance is when your hands can touch each other when straight. It's a gracie jj way of measuring. It means that opponent has to step closer to kick you.
If you are in rim distance ( Rodney King's) measure for CM1 game. Rim distanse is when opponent can reach your block, but not your chin:-) Opponent has to step to hit you.
CM2 is punching distance. Not a good place to hung around.
Then it's clinch and takedowns.
In ground you have three distances: feet, knees and elbow frames...
Also chest to chest and then you are in trouple.