The squat jump (SJ) is a simple, practical, valid, and very reliable measure of lower-body power. As a consequence, it is no surprise that this has become a cornerstone test for many strength and conditioning coaches and sports scientists. The CMJ has been shown to be the most reliable measure of lower-body power compared to other jump tests. Furthermore, the CMJ has been shown to have relationships with sprint performances, 1RM maximal strength, and explosive-strength tests. This suggests that performances in the CMJ are linked with maximal speed, maximal strength, and explosive strength.
Relative Age Effect
The common practice of placing children into age groups for sport may acutely benefit those who are more developed physically, emotionally, and cognitively . However, those who are born in the later stages of the year appear to experience an unintentional bias in their long-term sporting success . In accordance to this, it is important that coaches are aware of a ‘Relative Age Effect’, where being born at a certain time of the year holds a distinct advantage in sport and academic success. In other words, those born later in the year appear to be at a disadvantage because they are typically physically, emotionally and cognitively less developed than other children.
Velocity Based Training
Velocity based training appears to be a valuable tool for strength and conditioning coaches, personal trainers and others alike. The most commonly used technologies appear to be linear position transducers and accelerometers, examples of which are the GymAware device and the PUSH Band, respectively. Using the data collected from the devices, in certain circumstances, they appear to be a valid and somewhat reliable tool for predicting 1-RM using sub-maximal loads.
Although coaching is often referred to as an “art”, science is beginning to demonstrate that some coaching methods may be better than others, re-affirming the concept of evidence-based coaching. This article explicitly discusses how the type of coaching cue (i.e., external, internal, or normal) a coach uses can have a profound effect on the athlete’s short- and long-term performance, including their ability to retain the skill (i.e., perform it with the same quality at a later date). In most circumstances studied, external coaching cues appear to be more effective than both internal and normal cues for performance, skill development and retention.