Sapper,my widow hens are exercised from their own section daily and trap back into it.It gives you a couple of options,they can see their cocks before a race and will trap to the cocks section on return and are left there a few hours.If for any reason I don't want them to see their cocks,I let them through to the nestboxes when the cocks are out at exercise they are then basketed from their nest bowls and trap into their own section on return but don't see the cocks.I usually do this for midweek racing or if I think it's going to be a hard race and I want fresh pigeons for the next race,I can then send the cocks. One draw back with this is the hens don't exercise for very long(20mins)but they race twice a week.