The FIET was developed by Barbero et al. with the aim to test Futsal players' ability to cope with high-intensity intermittent exercise. The test protocol was a consequence of match and time-motion analysis to support the logical validity of the FIET. The FIET consists of shuttle-running bouts of 45 m (i.e., 3 × 15 m) performed at progressive speeds until exhaustion dictated by prerecorded audio cues. Every 45-m, subjects are allowed to actively rest for 10 seconds. After each 8 × 45 m, bout pla