No fucking way is that dull. I love playing with my kids. Plant my ass on the carpet and stack some blocks into jails or forts, build some lego houses and surround them with army men and unleash the mayhem that is the seven different Batman action figures fighting for the title of last batman standing.
I've also been getting him to do push ups and chin ups, my daughter is all about the dumbbells too, they always try to sneak into the home gym while I'm working out. It can really be distracting when you are squatting with headphones on only to be startled by a five year old pinching your ass.
I agree. My son is only 2 but he sure is fun!