custom exercise only added to diary

I have dozens of exercises that I want to log. I am not so much interested in its metabolical parameters but I want to log amount of time doing them, the date, stuff like that. It appears they only are added to the diary. Ya you also get the most recent but that is insufficient. It should be like Custom foods and recipes, available to add any time after creating them, as much as you want.

I wonder if I am just missing something but I don't think so.