My contis are in 7ft x 4 and a half foot runs (I think, could be wider) and they're perfectly happy in them, but then they're not too active during the day (esp not in this heat!) in the morning and evening I give them a run around the garden for about half hour each time to run off a bit of energy before bed. I assume they both get enough exercise as they're both not chubby and very happy (from what I can tell) If my garden were safer I'd let them out all day. I also try to bring them in the house when it's cooler so they have a change of scenery. Plenty of toys are a must as mine get bored very easily, most giants do. Frenchies are very sweet, you must be excited to be getting some!