I have a Fitbit because I'm into lots of sports, like biking, running, snowboarding, kayaking, etc.. It's pretty accurate with capturing steps.

If you're on a workout bike, rest your hand on your knee to get steps in. That works for me.

It's also amazingly accurate at capturing your sleep. I don't know how they do it, but I use it to monitor when my mood starts swinging up or down.

I recommend the Fitbit Charge if you're gonna get one. Don't get the cheap Fitbits. Fitbit charge has a screen to let you check your steps, while the cheapo ones don't have screens and you'll have no idea how many steps you've gotten unless you're checking your phone 24/7

Just my $0.02