If your body form prevents you from planking, then find an equivalent exercise or effort and do it for one minute. Be safe and know your limits. If you cannot reach one minute, try again next time.
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DONKEY.BAS (Wikipedia)Donkey, often known by its filename DONKEY.BAS, is a video game written in 1981 and included with early versions of the IBM PC DOS operating system distributed with the original IBM PC. It is a top-down driving game in which the player must avoid hitting donkeys. The game was written by Microsoft co-founder Bill Gates and early employee Neil Konzen.