You can perform physical acts such as running, swimming or climbing.
Check: Any time your character wants to perform a sustained physical activity such as running, climbing or swimming they must make a DC 15 Athletics check. Success indicates they are able to continue the activity without becoming exhausted. If the activity is in extreme heat, cold or other adverse conditions the DC is increased by 5.
Failure by 5 or more means the character is exhausted and cannot continue the activity. They gain a -4 penalty to all actions until they rest for eight hours.
