11.   Begin exercising at a comfortable warm-up pace for about five minutes, then speed up for a minute or two.

12.   A recent study indicated that exercising at a moderately hard level of perceived effort on a treadmill burned more calories than fancier machines.

13.   But not everyone can, or will, exercise at this level.

14.   But is exercising at home the best way to go?

15.   Deprived of fuel and exercising at a high level, the body can move into a state of energy imbalance, a kind of starvation mode.

16.   During each workout, subjects exercised at three different levels of self-selected exertion, from fairly light to hard.

17.   Earlier Tuesday, international observers said, the Israelis did appear to be exercising restraint at some points of conflict.

18.   Even worse, some have exercised options at high levels and watched the underlying stock collapse.

19.   Elite army units held swearing-in and officer graduation exercises at torchlight ceremonies.