Understanding marathon distances can feel tricky for beginners. Here are some important things to think about:

1. Standard Marathon Distance: A regular marathon is 26.2 miles long (that's about 42.195 kilometers). Many new runners think they can just "tough it out" and complete the whole race, but it's a lot further than it sounds.

2. Training Challenges: Finishing a marathon takes a lot of training. Most training plans suggest building up your running distance over several months. If you don't train carefully, you might feel really tired or even get hurt.

3. Types of Marathons: There are different kinds of marathons. There's the regular one (26.2 miles), but also half-marathons (13.1 miles) and ultra-marathons (any distance longer than 26.2 miles). Beginners might think these shorter races are easier, but they can still be a big challenge.

4. Mental Barriers: Running such a long distance isn't just physical; it’s also mental. It’s easy to have doubts and feel like you can’t make it from the start to the finish.

Solutions: To help with these challenges, beginners can:

• Gradual Training: Start with shorter races and slowly run longer distances.
• Structured Plan: Follow a training plan made for beginners and stick to it.
• Listen to Your Body: Make sure to rest and pay attention to how your body feels. If you’re really tired or hurting, take a break.

In the end, while running a marathon can be tough, you can handle it with the right preparation and positive thinking.