How to Read Your Runner: Assessing Condition at Ultra Marathon Aid Stations

Why This Skill Matters

In a 100-mile race, your runner will hit low points. That's not a possibility — it's a certainty. What separates runners who finish from those who don't often has less to do with fitness and more to do with the people supporting them at aid stations.

As a crew member, you are your runner's most important observer. Medical staff are spread thin across a 100-mile course. Race volunteers are managing dozens of runners at once. You're the one who knows your runner — who knows what they look like when they're fine versus when something is actually wrong. Learning to quickly and accurately assess their condition at each station is one of the most valuable skills you can develop.

Physical Signs to Watch For

Check these as soon as your runner arrives, while you're helping them with nutrition and gear. You should be able to run through this list in 30 seconds.

Skin and Face

• Pale, gray, or waxy skin — may indicate low blood pressure, dehydration, or serious exhaustion
• Flushed, very red skin in hot conditions — possible overheating
• Sunken eyes and dry, cracked lips — signs of dehydration
• Unusual swelling in the hands, face, or feet — can indicate hyponatremia (dangerously low sodium), a serious condition requiring medical attention

Gait and Movement

• A significant change in gait from earlier in the race warrants attention
• Excessive stumbling or difficulty standing still — fatigue, dehydration, or early hypothermia
• One-sided limping — a specific injury that may worsen over the remaining miles

Mental Status

• Confusion, slurred speech, or difficulty answering simple questions
• Glassy, unfocused eyes
• Unusual behavior compared to their normal baseline
• Inability to make simple decisions — what to eat, whether to sit or stand

Key Questions to Ask at Every Aid Station

Keep these quick and specific. Runners who are struggling often give inaccurate answers to vague questions. "How are you feeling?" gets you "fine" every time. These questions get you actual information.

• "When did you last eat? What did you have?"
• "When did you last drink? How much?"
• "When did you last pee? What color was it?"
• "Are you keeping everything down?"
• "Any hotspots on your feet? Any specific pain?"
• "How are you feeling compared to the last station?"

The last question is the most important. You're tracking trends, not just snapshots. A runner who was at a 4 out of 10 and is now at a 6 is improving. A runner who's gone from a 7 to a 3 in the last 15 miles needs your full attention.

Assessing Mental State

Mental lows in ultra running come in predictable patterns. Learning to distinguish them helps you respond correctly instead of panicking or dismissing something important.

The Dark Patch

Your runner is negative, says they want to quit, may be emotional or unusually quiet. This is normal and usually temporary. It often corresponds to difficult terrain, nighttime hours, or a caloric low. Address the physical needs first — most dark patches lift significantly with food, caffeine, and fresh socks. Don't take the "I want to quit" at face value.

Decision Fatigue

Hours of constant movement and problem-solving exhaust the brain's decision-making capacity. Your runner may seem unable to decide what to eat or whether to sit. Don't give them too many choices. Offer two options, or just hand them what you know they need and tell them it's time to go.

Detachment

Some runners go very quiet and disconnected. This can be normal in extreme fatigue, or it can indicate something more serious. Ask direct questions and watch for responses. If they're not tracking your questions or seem genuinely disoriented, involve race medical staff.

When to Encourage Moving On vs. When to Stay

A common crew mistake is letting a runner sit too long because they look bad. In most cases, the best thing for a struggling runner is to get back on the trail — movement often improves how they feel, both physically and mentally.

Encourage Moving On When

• They're eating and drinking, even slowly
• They can answer your questions clearly
• They're ambulatory and their gait is reasonable
• The issue is pain, fatigue, or low morale — not a medical concern

Consider Staying or Involving Medical When

• They cannot keep food or water down for more than 30-45 minutes
• Signs of hyponatremia: nausea, headache, puffy face and hands, confusion
• They're incoherent or cannot answer basic orientation questions
• They've had a fall or injury that may be serious
• Core temperature seems dangerously high or low

Tracking Changes Between Stations

The most useful thing you can do as a crew member is track your runner's condition over time. Note what they ate at each stop, how they looked, how their gait was, and whether things are improving or declining. When something changes significantly — good or bad — you'll catch it faster.

In a race with 15-20 crew-accessible aid stations over 30+ hours, trying to keep all of that in your head is unreliable. Writing it down, or logging it in an app, gives you an objective record that helps you make better calls as the race progresses.