Who am I kidding? I am too crabbed up to work out in my old age--but if you aren't, it's still OK to skip.
Yet may people don't want to break up their momentum--they feel if they skip they may lapse.
Elizabeth Quinn wrote about this on About.com. Rest days are critical to performance, she says.
Some reasons for this are psychological--but most are physical. Muscles need time to repair and rebuild.
Too few recovery days can lead to overtaining syndrome.
The body needs to adapt to the stress of exercise for the real training effect to take place.
If you don't let the tissues knit (the tiny muscle tears) and fluids to be replaced, you can feel kind of sick, stales, depressed, and not do as well with each form of exercise.
Yes, alternating strength and aerobic can help, but you also need to knock off sometimes.
Short-term recovery is at the end of a session, but long-term recovery must be built in a year's schedule, Quinn says.
Key to the short-term, especially, is getting enough sleep.
What if a day off turns into three days or more...Catch yourself and start anew.