10 Pack of Classes / circuit usage at The Lab in DUMBO. Classes can be reserved 2 days in advance and canceled 2 hours prior to the class to avoid being charged. Visit their website for a look at the many classes they offer, or take advantage of their circuit and go through it on your own or use Podcasts to guide you. The Lab has designed the circuit to fulfill all your fitness needs in 55 minutes. You will get a total body cardio/strength/flexibility workout, and avoid boredom & injuries associated with repetitive stress syndromes.