Method 10533 of Irvington has introduced the River towns to “the Lagree Fitness Method” — the only workout regimen to have earned two U.S. patents. Every workout will address the five, basic elements of optimal fitness — cardio-respiratory, core stability and balance, endurance, flexibility and strength-building.  It does not add muscular bulk.   Designed for men and women, “the Method” offers a 40-minute, low-impact, yet high-intensity experience. It is especially safe for teenagers as it focuses on core alignment while not overloading joints and connective tissues.  More information — www.method10533.com, or (914) 693-6020.