So last week I got into more 'crossfit' side of things. My lunchtime regimes are similar.. but now it's on a larger scale. Instead of smashing out 40minute sessions in an enclosed area with limited equipment, I'm outside in the elements, using a range of equipment (powerbands, kettlebells etc) working on flexibility, agility, strength and cardio.
A lot of people are skeptical and hate on crossfit(ters), but personally I think it's a great blend of building muscle, gaining strength and being aerobically fit.