My husband can’t keep up with me in bed

Q. I’ve recently got really fit aged 45 and have completed a couple of marathons. 

As a result, I’ve become more energetic in the bedroom. At first I loved it, so did my husband — but sometimes I wish he had the same stamina. It’s not that I’m not attracted to him, but I worry about our mismatched energy levels.

Exercise has significant sexual benefits for men, too. There is a direct correlation between increased physical activity and improved erectile function in middle-aged men, but a 2012 study found that increased physical activity is associated with better sexual function in men as young as 18.