Unfortunately the hights are poor in this flatland. So to train the climbing I use the firm headwinds we have got here, biking with fast speed against it.
Limits, I am not using any heartbeat things.There are several limits you can encounter during training.
The first limit of exhaustion you can cross. Biking through this limit gets you in
the so wanted bike-flow, every thing goes easy and smooth, you can go on for hours.
The second limit of real exhaustion you have to avoid to cross. Crossing this means that you get a little desorientated and biking becomes somewhat dangerous.