High-intensity interval training (HIIT) improved age-related decline in muscle mitochondria. 4 minutes on a stationary bike – 3 minutes off – 4 repetitions – 3 times a week! I can do that AND throw in some weight training on the off days! Here’s a link to the article: goo.gl/CFb82g
High-Intensity Interval Training (HIIT) for Old Muscles
