Working out is tough. Activity trackers like the Nike+ FuelBand are good motivators, but they’re bad at crunching important data. Some can fail to track calories burned by as much as 40 percent, according to a study last year from Iowa State University. Still, technology can help you lose weight and get in shape if you know what to use–and how to use it. Jumpstart your summer fitness regimen with these tools.
This article was originally published in the June 2015 issue of Popular Science, under the title “The Lazy Hacker’s Guide To Fitness.”