The Chicago Marathon will feature four water refill stations this year, a first for a World Major Marathon. These stations will be at mile 5.7, 10.1, 15.7, and 20.3. Runners can still opt for disposable cups at aid stations.

This move follows the Paris Marathon's elimination of single-use plastic bottles and cups. While many runners praised the sustainability effort, some faced delays and bottlenecks. The Chicago Marathon aims to balance sustainability with runner performance. Read more culture coverage.

The initiative allows runners to choose their hydration method, reflecting the importance of environmental sustainability in racing. However, if it affects race times, usage may be lower than expected. Related: Kale Sprouts and Lactate: What Runners Need to Know.

This original Runner World brief is based on reporting from Canadian Running. Visit the source for its complete reporting, context and any later corrections.