Saucony Endorphin Speed 5 Trainers - Grey - Black - Size 9.5 UK

Yes, they are highly capable of handling marathon training, particularly for speed work and long-distance tempo runs.

You should have about a thumb's width of space between your longest toe and the front of the shoe to allow for foot swelling during exercise.

While they are primarily designed for running, the stable base makes them acceptable for light gym work, though they are not intended for heavy weightlifting.

Most high-performance trainers have a lifespan of 300 to 500 miles, depending on your running surface and body weight.

No, the upper is designed for breathability. They will get wet in heavy rain.

The Endorphin Speed 5 is built for efficiency and speed; focus on landing mid-foot rather than heel-striking to maintain better control.

Try adjusting the lacing pattern to a 'runner's loop' or looser configuration to relieve pressure across the bridge of the foot.