Wow what a work out! They have two locations. One in Portland and in Scarborough. This place is the bomb. I have only attended the Scarborough location so far. Dynamics provides two different group classes. An introduction/beginner class that is 45 minutes long and a regular class for an hour. They have a ton of different classes throughout the day to accommodate people working. The classes usually begin with a warm up and stretching and then they lead into a few different circuit workouts. Every time a go there is always a new work out or a it has been modified so you are not working out the same part of your body. You will do a lot of things using your own body weight which is a lot harder than it seems. The instructors are very nice and will motivate you and not in a condescending way. $ 7.50 for one class or 6 dollars a class(60 dollars) if you purchase the 10 class pass which is a steal, cash or check only, no cards taken. Bring a water bottle and change of shoes if you can. The first time walking threw the door is the hardest part. Embrace it! They want you to succeed there and so do you.