If you're truly a monster, try doing leg lifts with a medicine ball hanging from your feet. Or hang from a pull up bar and raise your legs in front of you all the way up to the bar.
如果你真是一个牛人的话，试着在脚上系个健身实心球，或是在双杠上练习悬垂举腿，把腿一直举到双杠上面。
This paper made a comprehensive analysis of the reasons for non-normal failure of breaking head, collet and pull bar of PTM and further brought up the solution to it.
主要分析了电解多功能天车打壳机构中打击头、夹套、拉杆非正常失效的原因，并提出了解决的方案。
Combination: Arm extension, horizontal bar, pull-up, stepper trainer, waist Twister.
包含：上肢牵引器、单杠、引体向上、台阶训练器、扭腰器。
Combination: Arm extension, horizontal bar, pull-up, stepper trainer, waist Twister.
包含：上肢牵引器、单杠、引体向上、台阶训练器、扭腰器。
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