Type of exercise performed: long-distance running and climbing on and off the treadmill. Advantages: โข Lightweight. โข Minimal branding and packaging. The toe is neither too wide nor too narrow. โข ideal tip length; not too long but not so short that the double binding would hurt the top of the foot. โข Seems to handle midfoot and heel strikes well with no adverse side effects (but I've only tested this on 3 occasions). Body weight, fitness level, running surface and weather all play a role in how well a shoe will hold up.) Anchor weight which may be related to other models from this brand or alternatives such as the Gel Nimbus 19-22. I would recommend checking with your local Brooks store for a fitting for your foot. This helps determine your stride/gait and your walk and run type. The last thing you want is to buy shoes that don't offer the support you need for your body and your workout.