However, although effective, the 1RM test may be impracticable in athletic settings. Thus, the 1RM test can be considered a relevant assessment for training prescription. PPO Based on the Relative Percentage of 1RMДЄs mentioned in the previous section, the PPO is typically represented by a percentage value of the 1RM test ( Kawamori et al., 2006 Cormie et al., 2007a, c Kilduff et al., 2007 McBride et al., 2011 Comfort et al., 2012b, 2015 Suchomel et al., 2014a, b, 2015a, 2016 Kipp et al., 2018). Therefore, the purpose of the manuscript is to provide a rationale for the use of BM as an alternative for PPO identification and also to explore advantages and disadvantages of this method. The use of this alternative may offer advantages as it eliminates the need to perform 1RM tests and to prescribe loads based on different exercises ( Suchomel et al., 2019). A practical alternative that emerges as a possible solution is the use of a relative percentage based on the body mass (BM) of the athletes ( Suchomel et al., 2019). Given the disadvantages of using the 1RM test, it has become apparent that there is a need for practical alternatives to determine the PPO in the weightlifting derivatives. These disadvantages will be further addressed in the next section. Moreover, because there are no standard 1RM test procedures for some of them, relative loads from different exercises (HPC and PC) are used as a reference for load attainment. Specifically, 1RM testing can be very time-consuming ( Chapman et al., 1998 Niewiadomski et al., 2008 Loturco et al., 2017a), and also be impractical for some weightlifting derivatives (e.g., JShurg, HHP, and MTCP) ( Suchomel and Sole, 2017 Suchomel et al., 2019). Although this strategy is effective, 1RM testing in weightlifting derivatives presents some challenges. Usually, PPO is represented by a relative percentage of the one-repetition maximum test (1RM) ( Kawamori et al., 2006 Cormie et al., 2007a, c Kilduff et al., 2007 McBride et al., 2011 Comfort et al., 2012b, 2015 Suchomel et al., 2014a, b Suchomel et al., 2015a, 2016 Kipp et al., 2018). Despite the importance of prescribing exercises at the load at which the PPO is achieved, the means by which PPO values are obtained may present as a barrier to practitioners. For example, the PPO of the jump shrug (JShrug) ( Suchomel et al., 2014b, 2016 Suchomel and Sole, 2017 Kipp et al., 2018), countermovement shrug (CShrug) ( Meechan et al., 2020b), hang high pull (HHP) ( Suchomel et al., 2014b, 2015a Suchomel and Sole, 2017), hang clean pull (HCP) ( Meechan et al., 2020a), mid-thigh clean pull (MTCP) ( Haff et al., 1997 Kawamori et al., 2006 Comfort et al., 2012b, 2015), hang power clean (HPC) ( Kawamori et al., 2005 Kilduff et al., 2007 Suchomel et al., 2014a, b Suchomel and Sole, 2017 Kipp et al., 2018), and power clean (PC) ( Cormie et al., 2007a, b, c McBride et al., 2011 Comfort et al., 2012a) have been previously identified. Consequently, the PPO for these exercises have been studied extensively. Weightlifting derivatives (i.e., exercises that omit a portion of the snatch or clean and jerk) ( Suchomel et al., 2018) are regularly used in power training programs ( Ebben and Blackard, 2001 Durell et al., 2003 Ebben et al., 2004 Simenz et al., 2005 Gee et al., 2011 Jones et al., 2016). Thereby, numerous researchers have investigated the PPO for exercises frequently used in physical training programs ( Cormie et al., 2007c McBride et al., 2011 Comfort et al., 2012a Suchomel and Sole, 2017). One of the appropriate strategies to accomplish this goal is to perform a given exercise at the load that acutely results in the highest peak power output (PPO), described by many authors as the вЂњoptimal loadвЂќ ( Kaneko et al., 1983 Wilson et al., 1993 Kawamori and Haff, 2004 Cormie et al., 2011 Loturco et al., 2016 Sarabia et al., 2017). For this reason, strength and conditioning coaches dedicate a significant amount of attention to training strategies aimed at increasing athletes' mechanical power capability.

Several studies have demonstrated moderate to strong associations between mechanical power and important sports tasks, such as vertical jump and sprint performance ( Loturco et al., 2015a, c Marcote-PequeГ±o et al., 2019).

Mechanical power is a key component for sports performance ( Kawamori and Haff, 2004 Haff and Nimphius, 2012).

Clean pulls