By training together you will be saving upwards of $50 per session. By training together there is no need to buy two separate training sessions at full price. Although it is about a 25% increase to train together you will be paying far less than you would for a regular training session.
Many couples already spend considerable time apart because of career demands and other responsibilities. Having a scheduled workout appointment with a trainer is a way to guarantee that you will have at least a bit of bonding time each week away from work, home, and kids.
Sticking with an exercise program is easier, if you have a partner to workout with. This is probably the most important part of couples training. Knowing you have a standing appointment can be extremely motivating for you not to miss a workout.
The Department of Kinesiology at Indiana University found that couples who worked out separately had a 43% dropout rate, while those who went to the gym together had only a 6.3% dropout rate.