There are a few common structures for training.
One-on-one Training - The typical personal training model is one-on-one training - one client, one trainer. The advantage to this for the client is personal attention. The disadvantage is you lack a support group or driving competitive group like in group or semi-private training. It is also generally more expensive than group or semi-private training. For the trainer, the advantage is having only one client to concentrate on, but financially it's much less lucrative than a larger number of clients at even a steep discount.
Small-Group Training and semi-private training - An increasingly common alternative is small-group training, also known as semi-private training. In this model, there is one trainer but multiple clients. All of the clients may do the same workout (group training), or they may do different workouts (semi-private training). The advantage for the client is that this is cheaper, generally, than private training. You also get a group of people to act as a support group and to drive you to succeed. Even if your workout is entirely solo and unrelated to the others, you can still feed off their successes and push yourself to perform in front of them. The disadvantage is the lack of attention - the trainer will need to rotate through the groups, so the client can't get his or her undivided attention. The advantage for the trainer is a better pay rate for the hour even as client costs are lower. The disadvantage is the need to program for many clients at once.
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