The Maine Center on Aging at the University of Maine is helping seniors strengthen their muscles, bones and joints through a federal program it manages, reports the Bangor Daily News. Volunteers with the Retired and Senior Volunteer Program or RSVP run Bone Builders fitness classes for around 150 seniors in Penobscot, Piscataquis, Hancock and Washington read more Maine Center on Aging helps seniors stay fit, BDN reports