im a bit confuse about this topic. in making an adsense site, which is better? targeting 1 long tail keword or more? let say im targeting the phase 'abdominal equipment exercise' then im limited to write article on this phase. if i wanted to target more phase for the root keyword of 'exercise' then how can i optimize my site (for SEO purpose - on-page optimization) with 2 or more long tail keyword. is it good exericise?
I suggest you to use 1-2 keywords only in domain. You need to think for longer term... I mean.. you need to think that visitors might come back easily if your domain is shorter, easy to remember and have guality content. cheers!