The size of the statistical sample is estimated based on statistical calculations of 108 people. Using block design randomization method (6 blocks of 3) and using a table of random numbers, sampling is done. In general, the samples are divided into three groups: virtual and face-to-face training and control group. A total of 36 people in the control group; And 36 people receive virtual training and 36 people receive face-to-face training over a period of 6 weeks. Thus, the samples were randomly divided into three intervention groups (including virtual training group and face-to-face training group) and control group. Thus, all possible modes for placing the letters A (virtual training), B (face-to-face training) and C (control group) in 6 blocks with a 1: 1 allocation ratio were considered and the required number of blocks based on the number of samples The case study was identified.Then, according to the required number of blocks and based on the table of random numbers, the blocks related to each table number were listed, respectively. Finally, when the samples were included in the study, each person took a specific letter in the order obtained. For example, according to the order (ABCACB \ BACBCA \ CABCBA), the seventh person was in the intervention group (A).In order to hide random allocation, the method of opaque sealed envelopes with random sequence was used. In this method, first, a random sequence was created by a table of random numbers and based on the sample size of the research (108 people), 108 opaque envelopes were prepared (in order not to clarify the contents of the envelope). Each random sequence created by a person who was unaware of the purpose and subject of the study was recorded on a card and the cards were placed in envelopes in order. In order to maintain a random sequence, the envelopes were numbered in the same way on the outer surface.Finally, the lids of the envelopes were glued and placed in a box, respectively. At the beginning of the sampling, the researcher, based on the order of entry of eligible participants into the study, one of the envelopes was opened in order and the specialized group of the participant was revealed. The person evaluating the outcomes and the person analyzing.