Hanging knee raises. Chinup bar required. (Video.)
悬垂屈膝举腿。需引体向上杠杆。(视频)。
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If you don’t have at least one or two pieces of equipment — a chinup bar or a resistance band perhaps — some muscles don’t get worked out as much as others.
If you add just one or two pieces of equipment: a dumbbell, a kettlebell, a jumprope, a medicineball, or a chinup bar, for example, you can increase thechallenge even more.