You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <pageswithprop gpwpcontinue="1166" />
  </query-continue>
  <query>
    <pages>
      <page pageid="76" ns="14" title="Категория:Тренинг" contentmodel="wikitext" pagelanguage="ru" touched="2016-12-03T12:40:15Z" lastrevid="3692" counter="46903" length="8946" />
      <page pageid="121" ns="14" title="Категория:Питание и диеты" contentmodel="wikitext" pagelanguage="ru" touched="2016-07-08T18:37:11Z" lastrevid="598" counter="19697" length="12444" />
      <page pageid="123" ns="14" title="Категория:Фармакология" contentmodel="wikitext" pagelanguage="ru" touched="2016-12-07T13:04:03Z" lastrevid="42396" counter="24873" length="9927" />
      <page pageid="124" ns="14" title="Категория:Здоровье" contentmodel="wikitext" pagelanguage="ru" touched="2020-06-15T12:14:37Z" lastrevid="239" counter="9354" length="4693" new="" />
      <page pageid="130" ns="14" title="Категория:Книги и журналы" contentmodel="wikitext" pagelanguage="ru" touched="2016-12-18T11:44:18Z" lastrevid="4923" counter="16636" length="18170" />
      <page pageid="187" ns="14" title="Категория:Набор массы" contentmodel="wikitext" pagelanguage="ru" touched="2016-12-03T13:32:37Z" lastrevid="356" counter="13641" length="2206" />
      <page pageid="192" ns="14" title="Категория:Сжигание жира" contentmodel="wikitext" pagelanguage="ru" touched="2016-07-06T17:27:32Z" lastrevid="359" counter="8394" length="1728" new="" />
      <page pageid="196" ns="14" title="Категория:Внешность и красота" contentmodel="wikitext" pagelanguage="ru" touched="2014-04-11T07:31:08Z" lastrevid="363" counter="7761" length="1355" new="" />
      <page pageid="396" ns="0" title="Muscle and Fitness" contentmodel="wikitext" pagelanguage="ru" touched="2014-04-10T06:55:04Z" lastrevid="622" counter="5120" length="18263" />
      <page pageid="855" ns="0" title="Железный мир" contentmodel="wikitext" pagelanguage="ru" touched="2014-04-11T07:21:40Z" lastrevid="1281" counter="2453" length="15285" new="" />
    </pages>
  </query>
</api>