I think I spent $150 on my last pair of running shoes and already it's time I dole out more cash on this fitness necessity. Exercise just might break my bank over time -- unless I scale down on the price a bit.

Experts say paying less for sneakers is a wise move -- and it won't compromise quality at all. Just stay in the $85 range and all will be well, says a recent study in the British Journal of Sports Medicine. Spend less and you might sacrifice support and cushioning. Go overboard and you won't gain anything much.

As for replacing your athletic shoes, strive for at least every six months or every 300 to 500 miles. Even if your shoes still look good on the outside, chances are the insoles will be worn out and the tread will be nearly gone.