Denise Austin shares her secret to staying fit in your 40s, 50s and 60s

As we get older, we're all aware that when it comes too staying fit, the mind grows more willing but the body seems to go in the opposite direction.

But how exactly does fitness change as you age?

From stepping up the cardio to strengthening your core, US fitness expert Denise Austin has shared her secrets to staying fit in your 40s, 50s and 60s.

Take a look at the video above to find out more.