I love Fit Split and much as I love 4Day Split. I like doing cardio and wts on the same day or if I'm short on time just doing one or the other. The abs make a great warmup for my heavy lifting days at the gym(8 min. drive). And like X Train it has short segments I can do at night if I feel the need for a little activity while the days are short. Thank you for a great workout series.