This study is about preparing the body with exercise before a period of not moving a knee. It lasts for 10 weeks and involves 24 younger people aged 20-35 and 24 older people aged 65-85. The study includes a period where one knee is not moved for 7-10 days, and then 4 weeks of heavy resistance exercise training (HReT), which is lifting weights to build strength. Half of the participants will also do HReT before the knee is not moved.

• The study duration is 10 weeks.
• Participants need to be healthy and not have certain health issues or habits like smoking or high supplement intake.
• There are no mentions of specific compensation or risks, but some exclusion criteria involve previous medical trials or conditions that could affect participation.