The sky turns ink by half four and the city exhales. You watch commuters fold into padded coats, buses blink orange, the ...

You know you should develop a regular exercise routine, but you lack motivation. Promises to yourself are quickly broken, and you never establish enough of the workout habit to experience any rewards.

"When dozens of people are working out together in a confined studio, the air can quickly become congested," Richardson says.

How was your summer holiday? Mine was filled with visiting beautiful European cities, stays in cozy hotels, lovely swimming pools, delicious cocktails, watching the Netherlands win (gold) medals at ...