The goal of the class is to help students raise their heart rate levels to their personal target goal and sustain it for 20 to 30 minutes, and, of course, have fun doing it.
(The goal of the class; is; to help students raise their heart rate levels to their personal target goal and sustain it for 20 to 30 minutes) (fun; doing; it) (students; sustain; it; T:for 20 to 30 minutes)
The goal of the class fun students
is doing sustain
to help students raise their heart rate levels to their personal target goal and sustain it for 20 to 30 minutes
it
it T:for 20 to 30 minutes