John spent the last few decades doing crossfit, but now that he's a bit older, he's decided to switch to more individualized training to retain the physical benefit of
- strength building
- footwork and balance
- scoring and strategy
- rhythmic movement

- strength building

Explanation:

To have more strength building, you need to do bodybuilding. Who wants flexibility, does stretching classes. Already those who want to improve breathing capacity, seeks swimming. Wouldn't it be better to do one workout that combines all the benefits for the body at once? This is the purpose of CrossFit.

The practice consists of performing functional exercises that combine strength, cardiovascular and respiratory endurance, agility and flexibility with each other. These are high intensity workouts with average time between 40 and 60 minutes, taking the body to its extreme and challenging its limits.

John has decided that he needs to stop crossfit and start another kind of physical activity, but wants to maintain the benefits that crossfit allows. Among the options given in the question, what represents a benefit of crossfit is "strength building" which is exactly what John decides to keep.

a.) carbohydrates

i believe

it means your tired?