Performance monitoring system

A system for monitoring performance of a user, the system comprising:

• at least one processor;
• and
• at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the system to perform operations comprising:
• obtaining force data measured by at least one force sensor coupled with one or more poles and velocity data measured by at least one sensor for measuring velocity of the user;
• determining poling power based on the force data and the velocity data;
• and
• outputting a poling power indicator based on the determined poling power, wherein the system further comprises:
• at least one grip comprising the at least one force sensor;
• and
• at least one adapter configured to enable the at least one grip to be attached to at least one pole, wherein the at least one adapter comprises a flexible extension element configured to radially extend to enable attachment of the at least one adapter to the at least one pole, wherein the flexible extension element is configured to radially extend inside a hollow of the pole using one or more fixing elements.