The goal of this randomized counterbalanced repeated measures study is to test beet-root juice supplementation and red light therapy augment forearm muscle endurance in apparently healthy older adults over 65 years of age. The main questions seek to answer the following question:

Does beet-root juice supplementation improve forearm muscle endurance compared to a placebo supplement?

Does red light therapy improve forearm muscle endurance compared to a sham light exposure?

Does beet-root juice supplementation in combination with red light therapy improve forearm muscle endurance compared to a placebo-sham light control?

Inclusion Criteria:

• Self-reports performing at least 30 minutes of light to moderate intensity physical activity 3 times per week for the last three months

Exclusion Criteria:

• Currently smoke
• Have smoked within the last 6 months
• Are taking taking supplements known to increase blood nitrate levels
• Have a known kidney disease
• Have a known liver disease
• Have a known thyroid condition
• Have a known gastritis condition
• Are taking medications that are known to cause complications with nitrate supplementation
• Have known or reported joint pain within the dominant hand