I have cheated lots. As we say, its not cheating if you dont get caught. Ive spent most of my life competing in motorsports of some kind. 20 years ago i raced motocross professionally for 2.5 years. My career was plagued with injuries and finally ended with a broken back. But i raced motorcycles with motors that had more displacement than allowed. Because the races are a combination of heats (motos), i had friends finish races for me because of injuries. I had to pick someone of similar size, then they would wear all my gear, and run the second half of rhe race for me. Ive used illegal fuels. Ive raced cars that were under weight. Ive also raced drag bikes made from cro-moly tubing that had a wall thickness lesser than the rules allow. The tech inspectors have an ultrasonic gun that they use to verify that the tubing is the correct thickness. But filling the tubing with expandable foam tricks these devices into thinking the tubing is thicker than it really is. We obviously did this to save weight.
Ive also raced some 24 hour mountain bike races. The rules state that you are not allowed to get help from others to repair things like flat tires. In a race the previous year, we had so many problems with flats, that the next year we carried 2 way radios. I used the radio to have a team mate meet me on the trail with a spare wheel. The advantage is huge. It takes seconds to change a wheel. It takes minutest to change an inner tube.
I dont know how to answer your question, maybe i cheated a little. I dont call it cheating, i call it competing