Final answer:
In a class with a mix of fitness levels, the instructor should use a differentiated approach and provide various activities and modifications to accommodate different abilities. They can also incorporate team-based activities for collaboration and support.
Step-by-step explanation:
In a class with a combination of fitness levels, the instructor should implement a differentiated approach to accommodate the diverse needs of the students. This means providing various activities and modifications to cater to different abilities.
For example, the instructor can offer different levels of intensity or modifications for exercises based on individual capabilities. Additionally, the instructor can incorporate team-based activities that encourage collaboration and support among classmates.