Contact us TK How can my bike rides contribute to the challenge? FAQ - Easy access to health care(Level 1) / Getting health care in Germany and abroad(Level 2) / TK-Fit - your personal fitness tracker(Level 3) / TK-Fit: FAQs for iOS devices(Level 4) / To record your bike rides, start a cycling workout via an app or wearable. This will then be transferred to TK-Fit.