Presenter Anne Diamond, astrologer Russell Grant and former Hollyoaks star Mikyla Dodd are among the stars who have signed up for the next series of Celebrity Fit Club.
This Morning television expert Sharon Marshall, darts ace Bobby George, ex-footballer Mickey Quinn and journalist Carole Malone are also in the line-up.
"Drill sergeant Harvey means business this year and sparks are sure to fly," an insider told The People. "He is really going to put the celebrities through their paces and they will be pushed to their limit.
"All the stars who have signed up could do with losing weight and they know it. But whether they'll be able to stick to the fierce regime is yet to be seen."