Editing Bodybuilding (section)

=== Weight training ===
{{Main|Weight training|Strength training}}
{{more medical citations needed|section|date=March 2022|This section covers medical topices, so [[WP:MEDRS]] should apply here.|talk=1}}
Intensive [[weight training]] causes micro-tears to the muscles being trained; this is generally known as [[microtrauma]]. These micro-tears in the muscle contribute to the soreness felt after exercise, called [[delayed onset muscle soreness]] (DOMS). It is the repair of these micro-traumas that results in [[muscle growth]]. Normally, this soreness becomes most apparent a day or two after a workout. However, as muscles become adapted to the exercises, soreness tends to decrease.<ref name="pmid7371625">{{cite journal | vauthors = MacDougall JD, Elder GC, Sale DG, Moroz JR, Sutton JR | s2cid = 28377940 | title = Effects of strength training and immobilization on human muscle fibres | journal = European Journal of Applied Physiology and Occupational Physiology | volume = 43 | issue = 1 | pages = 25–34 | date = February 1980 | pmid = 7371625 | doi = 10.1007/BF00421352 }}</ref>

Weight training aims to build muscle by prompting two different types of [[Muscle hypertrophy|hypertrophy]]: sarcoplasmic and myofibrillar. Sarcoplasmic hypertrophy leads to larger muscles and so is favored by bodybuilders more than myofibrillar hypertrophy, which builds athletic strength. Sarcoplasmic hypertrophy is triggered by increasing repetitions, whereas myofibrillar hypertrophy is triggered by lifting heavier weight.<ref name="mot">{{cite web|title=Weight Training Intensity or Volume for Bigger Muscles?|date=October 15, 2010 |url=http://www.motleyhealth.com/strength/weight-training-intensity-or-volume-for-bigger-muscles|access-date=February 24, 2012|archive-date=March 10, 2012|archive-url=https://web.archive.org/web/20120310092836/http://www.motleyhealth.com/strength/weight-training-intensity-or-volume-for-bigger-muscles|url-status=live}}</ref> In either case, there is an increase in both size and strength of the muscles (compared to what happens if that same individual does not lift weights at all), although the emphasis is different.<ref name=mot/>