5x5 is good for strength, I've done it a few times over the years. My go-to routine over the past 8 years has been a HIIT kettlebell routine. I do 30 seconds on

5x5 is good for strength, I've done it a few times over the years. My go-to routine over the past 8 years has been a HIIT kettlebell routine. I do 30 seconds on 30 seconds off. Swings, clean and press, mid-pulls, snatch, plank, Turkish getup. I do all of that twice. It takes 20 minutes. Good strength and cardio at the same time. Also I eat Paleo, except when I eat pizza.