For the block go to the drop step to the middle of the key to a jump hook.
Make sure you keep your back to the basket. Try not to turn side on.
The key to inside play is being able to keep your back completely to the basket.
Take plenty of shots on both sides with both hands.
Four players standing still make every ball handler's job harder. Teach V-cuts, L-cuts and back cuts so your team gets open and punishes defenders who overplay.
Good team defence is five players guarding the ball, not five separate one-on-ones. The shell drill is where that starts, so here is how to teach help-side positioning and rotations from the first week of the season.
Rebounding is the least glamorous thing in basketball and one of the most decisive. It is also almost entirely a habit, which means it is entirely coachable.