double distanceFormat = [self.runsArray[indexPath.row] valueForKey:@"runDistance"];

Initialising 'double' with an expression of incompatible type 'id'

double distanceFormat = [[self.runsArray[indexPath.row] valueForKey:@"runDistance"] doubleValue];

NSNumber *mynumber = [somedictionary valueForKey:@"runDistance"];

int i = [mynumber intValue];