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Flexible/stretchable strain sensors have attracted much attention due to their advantages for human-computer interaction, smart wearable and human monitoring. However, there are still great challenges on gaining super durability, quick response, and wide sensing range. This paper provides a simple process to obtain a sensor which is based on graphene (GR)/carbon nanotubes (CNTs) and Ecoflex hybrid, which demonstrates superb endurance (over 1000 cycles at 100% strain), remarkable sensitivity (strain over 125% sensitivity up to 20) and wide sensing range (175%). All results indicate that it is capable for human movement monitoring, such as finger and knee bending and pulse beat. Most importantly, it can be used as a warning function for the night cyclist's ride. This research provides the feasibility of using this sensor for practical applications. A stretchable strain sensor takes GR and CNTs as conductive fillers and takes Ecoflex as the substrate through simple ultrasonically mixture and coating process. It can easily match human movement to complete finger and knee bending, pulse beat and breathing monitoring. Furthermore, the application of safety warning for bicycle riders at night has been successfully realized. [ABSTRACT FROM AUTHOR]