Running-related muscular pain is common, especially if you're new to the sport or have just increased your mileage, and often subsides within a few days.
Lower resting heart rates can indicate greater cardiorespiratory fitness, as your heart is able to pump more blood with each heartbeat throughout your body.
Feeling difficult during a run does not necessarily indicate a problem, but it may indicate that something is off with your recuperation.
Your body need seven to nine hours of sleep per night. Your performance and recovery may suffer if you don't get enough quality sleep.
However, stress does not always necessitate a workout cancellation; in some circumstances, modifying the activity may be sufficient to avoid overstressing the body and mind.
If you're feeling wrong, even if it's a minor alteration, such as an eye twitch, waking up with migraines, or being ill more frequently.