Hi. I'm 51. My kids lives are slowing down a little so I can start investing some time in me. I need something to get more active, I was thinking about an indoor bike and working some of the apps. I have been trying to choose a nice bike. I have been drawn to the Bladez bikes, but am concerned that their resistance knob doesn't have any calibration so you don't know how much resistance you are using. Does anyone have any suggestions for a new bike for me. I'd like to stay around 300 bucks. Thanks for your replies.