It has been believed that if you attend an exercise group or train with a group of people that you won’t work as hard (i.e. you won’t be focused on as much by the trainer/instructor). While group exercise doesn’t suit everyone, it is a great alternative to exercising alone, because the other members of the group can help motivate you to work harder in the session. It can also provide some healthy competition amongst the group and is a great opportunity to socialise while training. It is also more likely that you will stick to the style of training you enjoy most. So, if the group environment suits you, then you will most likely achieve your best results through group training.