The goal of this clinical trial is to compare two types of shoulder strength training: low-load training with blood-flow restriction (BFR) and high-load training without BFR. The study includes healthy adults. The main questions it aims to answer are: Are changes in shoulder strength, power, endurance, and muscle mass similar with low-load BFR and high-load training? Researchers will compare strength training with BFR to strength training without BFR to see whether changes in shoulder muscle performance are similar. Participants will: * Provide basic personal details, body measurements (e.g., height and weight), and a brief medical history before starting. * Train in one of the two programs (BFR or no BFR) two times per week for 4 weeks. * Complete tests of shoulder maximum strength, power, endurance, and muscle mass at the start and at the end of the protocol.
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Change in Deltoid muscle mass
Timeframe: Baseline and between 24 hours and 1 week after completion of the 4-week intervention.
Change in shoulder muscle power
Timeframe: Baseline and between 24 hours and 1 week after completion of the 4-week intervention.
Change in shoulder muscle maximal strength
Timeframe: Baseline and between 24 hours and 1 week after completion of the 4-week intervention.
Change in muscle shoulder endurance
Timeframe: Baseline and between 24 hours and 1 week after completion of the 4-week intervention.