I take one kickboxing/insanity class each week at a local church (I LOVE IT!) but other than that I'm on my own for exercise. Running is usually my go-to - it has always been relaxing, calming and therapeutic to me. Then my kids turned 2 and 4 and I was like 'holy cow! Is there an actual COW in this stroller I'm pushing? One that won't stop talking to me or asking me for help.' So running as much as I try to get a few miles in here and there isn't always appealing. I tend to stick to play workouts - lunges, squats, and pull-ups on playground equipment, running races with my kids, jumping on the trampoline.
One of my favorite workouts to do is what I've dubbed the 10-20-30-40-50 workout. It takes me less than 30 minutes and you can do it just about anywhere. I do it at the high school near my house because they have a killer hill (about 50 feet or so and steep). I bring tennis rackets and soccer balls for the kids in the tennis courts, then bust my butt for 30 minutes.
10 hill sprints (up and down is 1. If you don't have a hill near you, sub 100 mountain climbers here or just sprint in your backyard or cul-de-sac.)
40 squats (or lunges)
50 sit ups or crunches
Repeat 4x. It takes me about 7 minutes per round. When I don't have 30 minutes, I'll only do 2 or 3 rounds and it's still a great work out - every exercise burns and every exercise you will feel the next day.