Hi Brinda. Conduct circuits! This will keep everyone in the group moving (thus a a cardio component) while performing strength, conditioning and flexibility exercises. Pipe in some good upbeat music and you’ll get, and keep, these folks moving.
I hope that this helps.
Exercise programming and sequencing is included in all of the nationally recognized certifications for this industry. I noticed you are not a certified trainer,(or have not listed it?) albeit this is not a mandatory factor, however, it would really help you with setting up programs such as the one you are inquiring about.