I know it's a bad idea coming in here, because you probably don't want to hear from me, but I feel you guys suggesting Vivian can do singing or scuba diving have forgotten he is smoking heavily for a number of years. Under those circumstances his singing voice will be damaged for him to carry a song to it's conclusion, which is what is required in a singing competition, I know this because here in the UK we have a celebrity that recently filed for bankruptcy because she could not do the profession that made her famous singing because of the number of fags she had had, that was her own words, another Superstar in America I'm not going to name her, similarly in the autopsy they discovered her vocal chords were not damaged however she had a smoking habit of a packet a day that was making her not sing. With scuba diving, when we are younger we can hold our breath for really long compared to when we are older, it's a discipline that has to be maintained through out our teenage and adult years to enter into it as a profession, but if Vivian is smoking so much again he cannot hold his breath for long underwater.
However cooking, if you show interest in cooking at home, and are adventurous in the kitchen, that means you like to try new flavours in your cooking, or perhaps you learnt from your mum how to cook and you enter a cooking competition, you can do that, so celebrity masterchef is a good choice, similarly if he loves adventurous pursuits he can do Katron ke khiladi (it's called fear factor here in the UK), although personally I would rather he did the cooking show rather then the other one because it's dangerous, you can lose your life with such things, and perhaps even suffer the after effects later on much after the series is finished recording, although for the camera you are being brave to face your fear.