A method for controlling a connection of a user to a gliding or rolling apparatus to which the user is retained by a releasable retaining system equipped with a two-state retaining member, a first state of said two states being a retaining state, a second state of said two states being a release state, said method comprising:
- measuring, during the retaining state of the retaining member, at least two distinct flexion or torsion angles between the user's upper leg and lower leg and determining a measured value for each of said at least two angles;
- comparing the measured value of each of said at least two angles to a respective posture-indicative value;
- transmitting a command to cause the two-state retaining member to be in said release state when, for each of said at least two angles, the measured value exceeds the respective posture-indicative value.