For basic disease prevention, the CDC recommends a minimum of:
2 1/2 hours/week moderate [or] 1 1/4 hour vigorous aerobic activity
2 x/week strength training working all major muscle groups
For optimum physical conditioning, the CDC recommends the following:
5 hours/week moderate [or] 2 1/2 hours/week vigorous aerobic activity
2 or more x/week strength training working all major muscle groups
At first glance, it does sound like a lot. But honestly, we're meant to be active. I know firsthand and endless research has shown that our minds, emotions, & relationships all benefit when we care for or bodies.
ps: I wish I looked that good when I'm working out.