Muscular strength and flexibility can be done at a different time, as long as you compile a minimum of two-three sessions of each weekly. Working out at a moderate pace might not get you absolute optimal gain, but you have a much lower risk of injury and you won't get burned out. Take things at your own pace. While many experts have a personal preference, it might not matter too much as long as you do both. But you don't have to do it that way.
Some people like to do their cardio portion first.
And that's fine. It's really a matter of personal preference, says Neil Maki, a personal trainer and owner of Dynamic Fitness in Bloomfield Hills. There may be slight differences from person to person, but studies have shown that most people get very similar results no matter what order they did the routines in.