How can i look for keywords with highest conversion and not just high volume?

Dear SEO experts,
is there any software or methods that can help me look for keywords that has high conversion rates? i understand high volume searched keywords doesnt mean high conversion. so is there any software or methods that can help me to find keywords with high conversion?

High conversion for what exactly? Each website has their own unique conversion rate and that information is not public so no tool can give you such data.

Fitness/Bodybuilding related.

Give me some keywords to target.

GO!

(Seriously)