I'm trying to gear towards HIIT. It's something I've never done before and have recently picked up. I can say I feel great afterwards with better HR results and in less time. I've also started jump roping again. It's amazing what you could do for hours as a kid practically kills you as an adult!
And see--there's the thing with eating. If you're lifting and working hard, you should eat more or so I've read of late.
Anyway...what works for one doesn't always work for another and at this stage in my life, I haven't found it yet. There's heart disease in my family and I do workout mostly for that and am pretty confident that my heart is healthy.