BONNEVILLE SALT FLATS, Utah - Think you killed your last spin class?
Well you've got nothing on Denise Mueller-Korenek.
The cyclist broke the Guiness world record for the fastest bicycle speed in a slipstream.
She reached 183.9 miles per hour at the Bonneville Salt Flats in Utah.
The race car hit approximately 100 miles per hour when Mueller-Korenek unclipped from the car and continued cycling on her own.
The previous record was set in 1995 by Dutch cyclist Fred Rombelberg.
He reached the speed of 167 miles per hour.