How can I try yoga without participating in the spirtual aspect?

This is an excellent question and a very common concern. A good yoga class will not "force" spirituality on you but will only introduce and teach it as an important part of the practice. However, this part of the practice is not for everyone and yoga is completely individual. Most yoga practitioners begin solely for the physical side of the practice and end up becoming more open and intrigued over time by the vast transformation in the body and mind as they delve deeper into all aspects of yoga, including the spiritual teachings. Before starting a yoga class, visit or call a local yoga studio and vocalize your concern, asking for suggestions on any classes that may suit you. Experiment with classes while you maintain an open mind. If you are already confident you are not interested in yogic spirituality, go to a gym for yoga as most fitness centers will focus on non-purist and more athletic styles of yoga. Some styles you might want to gravitate toward, often labeled power or athletic, tend to focus less on spirituality and more on movement. Most facilities should have detailed class descriptions listed which should give you a better idea of what to expect.