Crunches
In my educated opinion, crunches would be the best choice out of these options to build strength. A one mile run builds cardio, sit and reach and gymnastics build flexibility and some strength, crunches is strictly abdominal strength.
The answer is B, psychology.
Answer:
Explanation: "Welcome to strength endurance 101! This class will use your whole body, and no equipment is needed. Let's start!"
