With ever-longer work hours and limited park space, it can be tough getting enough exercise in the city.Fight flab by biking or walking to work, experts suggest. Mayor Bloomberg is getting into the coaching act, recently announcing the creation of more bike lanes.But not enough is being done to encourage New Yorkers to use their legs, some say. Wiley Norvell, a bike commuter and spokesperson for the commuter advocacy group Transportation Alternatives, said city and local companies should do more to encourage biking activities through infrastructure improvements, including bicycle storage space and greater protection for city cyclists."Creating protected space for cyclists is a big part of making cycling more convenient," he told the Resident. Referring to the city's recently opened stretch of buffer protected biking lanes, Norvell said that "the provision of protected bike lanes has the potential to expand biking to more than just the hardcore contingent of cyclists," a development likely to encourage recreational cycling while supporting other activities such as running.New York is tough on the body, making exercise even more important. "Hard work and long commutes cause not only aches and pains, but also trauma to the body," said Dr. Brian Kessler, medical director of Spine and Sports Medicine in Midtown, in a statement. In recent "rider report cards" distributed by the MTA, problems related to rush hour wait times, inadequate room onboard trains, and delays dominated the top three improvements most desired by straphangers.Exacerbating the problem are workplaces themselves. Stressful workplace environments that encourage sitting in place for long periods often lead to back and neck pain resulting from bad posture. "Since almost everybody has a computer in their workplace, we've seen a massive explosion of this type of problem, in a New York-type city magnified more than everywhere else," Kessler told the Resident.