How to get steps to count when biking??

Unfortunately, since the Charge HR is a step based tracker, it cannot accurately track steps for non-step activities such as cycling, skating, swimming, etc. Because steps are counted based on arm movement (specifically the swinging of arms while walking/running) it's hard to track steps when your arm is more or less stationary on the bike handle. Because of this, your distance information will normally be incorrect as well.

Ultimately, you will get credit for any steps recorded during your bike ride, for example your 2500 steps. BUT that's simply what your Fitbit is able to detect from bumps and such. There is no calculation for steps based on the actual bike ride.

If steps are more important to you than heart rate, you may try attaching your Fitbit to your shoe/ankle instead of your wrist. That might be a little more accurate as far as counting each cycle as a step. Or if you're going to be cycling more than walking, you may also consider lowering your step goal. Then you would have to know that even though your Fitbit doesn't detect 10k steps, you're still getting an equivalent exercise. For example a typical day for me without any exercise or extra walking is about 4500 steps. If I were to factor in a 2 hour bike ride each day (with 2500 steps), I would make my step goal about 7500.