CrossFit is characterized by being a standardized training program that improves
physical performance through the provision of several stimuli regardless of the
participant’s strength level. This study aimed to compare the acute
response in total repetitions as a measurement of performance, jump ability,
physiological demand (heart rate and blood lactate), and perceived effort
considering the participants’ strength level with individualized
intensity in CrossFit. Thirty-five participants were assessed and asked to
participate on two separate days in a standardized and relative ‘As Many
Repetitions As Possible’ (AMRAP) CrossFit circuit. Both AMRAPs comprised
strength, gymnastic and aerobic exercises, although only strength was
individualized according to the participant’s level. Before the
statistical analysis, participants were allocated to higher- or lower-strength
groups following the one-repetition maximum-bodyweight ratio in the push press
exercise. Results support the existence of a strong relationship between
strength level and total repetitions in both AMRAPs. In addition, differences in
total repetitions and rate of perceived exertion between strength groups are
discarded when AMRAP intensity is individualized while physiological demand and
jump ability are maintained. Thus, the higher-strength participants may benefit
from similar responses with a lower number of repetitions. Therefore, CrossFit
trainers should be encouraged to prescribe strength tasks based on the
percentage of 1RM for every training.