Final answer:
The principle of specificity is being applied to improve basketball skills by practicing the activity daily, gradually increasing the duration of practice.
Step-by-step explanation:
The principle of specificity is being applied in this scenario.
This principle states that to improve in a specific activity, you need to practice that activity. In this case, if you want to improve your basketball skills, playing basketball every day at lunch for 10 minutes and then increasing it to 20 minutes is a way to specifically target and develop your basketball skills.
By increasing the duration of the basketball practice, you are also applying the principle of progression, which suggests gradually increasing the intensity, volume, or duration of an exercise over time to continue making progress and avoid plateaus.