Back blows first, and most obstructions clear on the second one
First
Lean them forward and give five firm blows between the shoulder blades with the heel of your hand. Check after each one.
Then
If that fails, five abdominal thrusts. Alternate five and five, checking between each, and call for help after the first cycle.
Afterwards
Anybody who has had abdominal thrusts should be seen by a doctor even if they seem fine. Internal injury is possible and not always obvious.
