so wrong.
overtraining is not a ''bodybuilding" thing. You can easily do too much cardio and overtrain.
Sure, the pro mma guys train 8 hours a day, but they are conditioned to it. do you honestly think they just one day started working out that hard? No...they trained as hard as they could. they listen to their body. that is the difference between pros and hobbist. they listen to their body
Effects of Frequency and Duration of Running on Improvments of Fitness and Incidence of Injury
Subjects were untrained men, 20 to 35 years of age. Training intensity was between 85 to 90 percent of maximum heart rate. Percentages have been rounded.
When running more than 3 days per week, or more than 30 minutes per session, additional improvements in cardiovascular fitness are small,
yet the rate of orthopedic injuries are disproportionately greater. Although slightly higher increases of cardiovascular fitness were observed for the 45 minutes per session and 5 days per week groups, these programs are not recommended for beginning joggers due to
significantly higher rates of injury