So, you’ve resolved again to get fit in the new year. But if history is any indication, you’ll probably find yourself around Week 2 binging on sugar cookies after an electrolyte-depleting workout. That’s where your virtual workout buddy comes into play — you’ll be surprised at how effective the smallest of electronic nudges can be in helping you stay on track to meet your fitness goal. The five gadgets we tested all sell for under $200, and several come with free smartphone applications to help diligent dieters log their every bite. Even if counting calories isn’t your bag, these gadgets’ meticulous accounting of everything from your blood pressure to your total minutes on the treadmill may be just the reality check you need to put fitness first this year.