Exercising more frequently is a harbinger of a whole host of health benefits ranging from decreasing bodyfat, increasing insulin sensitivity (i.e., reducing diabetes risk), increasing bone mineral density (i.e., reducing osteoporosis risk), and increasing stamina, strength, power, speed, and endurance. Exercising more regularly decreases LDL (bad cholesterol), increases HDL (good cholesterol), increases metabolic rate, and reduces chronic disease risk (i.e., type-2 diabetes, heart disease, some cancers, obesity, stroke, gallbladder disease, and Alzheimer's disease). Additional exercise benefits include quality of life aspects: decreasing anxiety, stress, mortality, morbidity, risk of falls, and bone fracture risk. Working out more frequently rather than longer durations is simply a better approach to staying healthy and fit.
Bottom line: It's better to exercise a little each day (i.e., 10 minutes) three or more days per week than a lot each day (i.e., 2 hours) one or two days per week.
Brian Danley, CFT
"Motivation is what gets you started. Habit is what keeps you going."