see thats the ace thing about it you work at you level so groups have people of all fitness levels so some run, some walk some do both. If they are doing a session with a road run or walk the fittest ones go further so may do 8 km run and others 5 km walk!!! i was sooooooo unfit but loved classes as you do want to push yourself as people are better than you, if u cant do something they give you a different exercise.

and areas have diff time sessions my area has 0600 sessions, 6pm 7-30 pm diff days and sat 8am