The phrase "a mainstream activity" is correct and usable in written English.
It can be used to describe an activity that is widely accepted or practiced by the general public.
Example: "Yoga has become a mainstream activity, attracting people of all ages and backgrounds."
Alternatives: "a popular activity" or "a common practice".
"It's making watching games on a P.C. a mainstream activity".
"We are on the cusp of this becoming a mainstream activity," Mr. Sullivan said.
Shopping secondhand stores, once the passion of an eccentric minority, is becoming a mainstream activity.
Facebook made oversharing with a small army of friends a mainstream activity.
But the Noughties has been a standout period – mostly for the acceptance of video gaming as a mainstream activity.
But Rylance love-bombing only took off as a mainstream activity after Wolf Hall introduced his brimful features to BBC2.
Relatively low-cost MPEG2 encoders, coupled with widespread deployment of PCs with MPEG2 playback (or decoding) built in, add faster and faster internal network connections, and we're suddenly a lot closer to video as a relatively mainstream activity.
Who's to say?" Robert Bell, the legislator who is sponsoring the Virginia bill, said it represented increasingly nuanced parental thinking as home-schooling has evolved into a more mainstream activity, up from 850,000 students nationally in 1999 to 1.5 million in 2007, the latest figure available from the Department of Education.
Lawyers acting for Woodland argued that the school owed her a duty of care covering all mainstream activities, which applied even where third parties were contracted to provide teaching.
There seems no reason why canoeing cannot now become a more, ahem, mainstream activity.
Hayman says: "If the market can push even 1% [more] of traditionally commercial businesses to think smartly about their giving and transfer that into their mainstream activity that could have a far greater impact than creating a whole new sector of social enterprise.
