Possible Clues:

• Like many unfit folks' lifestyles
• Tending to stay seated
• Any dessert could make you inactive
• Sitting in position around study, heading off change
• Still I'm not into a certain type of rock
• Tending to spend too much seated and taking little exercise
• Occupation for a sitter
• What 5 down's work is not (9)
• Still working, but not exercising one's talents?
• Being so deters any movement