If they like to jump off the couch, maybe they'd enjoy a little indoor obstacle course. You don't have to put too much prep into it for it to be fun. Some ideas:
- lay a couple belts/ties/playsilks/ropes on the floor; they have to jump over them
- find a big cardboard box and open both ends for them to crawl through (it's even more fun when you lay a lightweight blanket or sheet over the box so they can crawl through a 'curtain')
- put a couple pillows or hand towels on the floor at various intervals; the kids have to jump from one to the other and try not to touch the floor
I have done courses for my kids when the weather was really horrible, and they had such a blast. And it was so much fun for me to watch; it helped get rid of all my Grump.
Also, on the topic of reconnecting...I recently discovered that when my son (age 4) gets grouchy, usually all it takes is five minutes of drawing together before he feels better. We had an extra-long drawing session last night after a big meltdown. Sometimes he doesn't think he wants to participate because he's too grumpy to play or read or draw. In that case, I say, "Okay, I'm going to sit at the coffee table and draw a picture. You're welcome to come over if you want to help." Usually within thirty seconds he's right by my side.
This seems to help when he's grumpy AND when I'm grumpy.
Okay one more thing. Sometimes I get in a cruddy mood for no particular reason, and I know the kids have nothing to do with it. I really don't want to take it out on them, but it's hard for me to cover up my mood. So I say, "Grrr. I'm grumpy." This usually opens dialogue and can end in a lot of laughs...sometimes the kids will sing goofy songs, or we'll do roleplaying (i.e. ds might say "and I'm ANGRY! ROARRRRRR!" and dd might say "and I'm sad! wahhhhhhhhh!"). It's a good way to vent, loosen up, and play with the kids all at once.