Most chin ups carrying a 40 lb pack in one minute

According to Official Guinness Records,

The most chin ups in one minute carrying a 40-lb pack is 27 and was achieved by Ron Cooper (USA) in Salem, Massachusetts, USA, on 27 June 2015. Ron also holds records for the most clap pull ups in one minute.

For a complete list of 2015 records, please visit 2015 Guinness Records in United States.

Other United States records that might interest you:

• Largest fruit cobbler
• Most basketball three point shots scored on NBA 2K9 in one minute
• Most holes-in-one in a single round of golf
• Most golf double eagles in a single round
• Most people riding a surfboard
• Longest line of doughnuts
• Highest Score on "Part of Me"DLC, Just Dance 4 (Xbox 360 Kinect)
• Largest parade of Jeeps
• Fastest time to duck tape (duct tape) a person to a wall
• Most people lighting a glowstick simultaneously
• Largest human representation of an interactive map
• Smallest working cannon