Buddhist practice and physical exercises What is the right mindset we should have towards physical exercises according to buddhist practice ? e.g. Weight training , cardio , running etc.

In my case I'm spending most of my day sitting at desk , so having some exercise is necessary to be healthy . But would this consider as clinging to body? I can understand having supplements such as protein shakes could be considered as clinging.
It is ok(ethically) to do physical exercises even for the purpose of being attractive. Lay people are not expected to follow the rules of monks. Such conflicts occur mostly when you try to live a monk's life as a lay person. Is it clinging/attachment that motivates you for physical exercises? Absolutely! But it's similar to asking if it is ok to have love affairs or get married.  They all involve unwholesome mind states. But you are mostly expected to keep to the 5 precepts as a Buddhist layman. So you should focus more on the 5 precepts as they can be easily broken if you are not mindful. If you want to live a more noble life, you can get ordained. Things become conflicting and confusing when you try to walk on the fence, not picking either lifestyle. 

In fact, it is clinging that makes you do the job you do. It is clinging that keeps you in lay life. If you don't have clinging, you can't live as a householder. You have to go get ordained within 7 days or die(parinibbana).