Standing at the foot of Mount Wachusett's slopes, Ray Jackman bends over and hoists Robbie McAllister out of his wheelchair and onto two neon yellow skis.
The teenager squeezes into a thick plastic seat mounted just above the skis.
"OK, there are a bunch of straps," says Jackman as he buckles the crisscrossing seatbelts.
Jackman is a program coordinator at the Massachusetts Hospital School, a state-run facility. It's half school, half pediatric hospital, and all 85 students are patients, with serious, long-term conditions.