Note that defense is easy to teach and learn compared to offense. After working on defensive position and movement, teach defense in each situation from the basket outward . Condition your players. Conditioning makes a difference. In the last few minutes of a game, conditioned teams make fewer mistakes and move faster than poorly conditioned teams.
Conditioned players are better athletes.
All conditioning should involve basketball skills. Transform even kamikaze drills into something useful by making players dribble. Write down your practice plan. You can get 5-10 times more from your players if you plan. Plan for the day, week, month, and season.