NEW HAVEN, Conn. — Before climbing Mount Kilimanjaro, Andy Gardner and Sam Fischgrund had to tackle several obstacles. They walked on an incline on a treadmill to prepare for the miles of ascent in increasingly higher altitudes. What the two men — clients of Chapel Haven Schleifer Center, which works with adults with developmental and social disabilities — did not heavily consider was whether their disabilities would hold them back. Gardner gave credit to Chapel Haven trainer Kim Stack for preparing him for three days of climbing, traversing about 15 miles per day. Both Gardner and Fischgrund said they worked to stay focused on their goal during their trip up Mount Kilimanjaro as they continued to put one foot in front of the other.