Final answer:
The word in question is "dribbling" which is a skill in soccer and hockey, and a penalty in basketball when committed incorrectly. Basketball players improve their shooting accuracy through consistent practice and shooting drills that focus on form and precision.
Step-by-step explanation:
The 11-letter word ending in "-ing" that is a necessary skill in soccer and hockey but a penalty in basketball is dribbling. In soccer and hockey, dribbling refers to the skill of controlling and moving the ball or puck on the field or ice while avoiding the opposition's players. In contrast, in basketball, a player committing certain dribbling violations can result in a penalty being called, such as double-dribbling, where a player stops and then resumes dribbling, or palming the ball while dribbling.
To improve their shooting accuracy, professional basketball players practice consistently, often with shooting drills that emphasize form and technique. The precision required is evident when considering the size of a basketball hoop in relation to the ball. Given the basket's diameter of 18 inches and the ball's diameter of just under 10 inches, accuracy is crucial for success in scoring. The practice regimen for basketball players includes repetitive shooting from different positions and under various conditions to develop muscle memory and improve their shooting accuracy.