Create and rotate rosters – Standing on concrete for long hours and not moving very far put extra stress on the feet, legs and back. If there is an opportunity for some job rotation among staff every few hours, the change in routine and work can be beneficial. Even though they might still be on hard floors while moving cows, for example, the extra walking and break from the constant reaching can be beneficial.
Wear good boots – Insist that your staff wear good boots if they are going to be standing and working long hours on hard floors. A cheap 'barn boot' might keep the feet dry, but most of them don't offer much cushion to the bottom of the foot or support to the arch. Maybe you need to suggest your employees buy good shoes with adequate supports and wear a lightweight, waterproof rubber boot over them. An incentive could be the employer paying toward shoes and/or boots that will meet those criteria.
Install cushioned matting in the pit floors – A relatively cheap rubber mat under foot can make a big difference in how one feels standing in the parlor all day. Long hours on hard surfaces are extremely hard on feet and legs, plus many people will feel extra stress in the lower back. A simple mat can reduce that fatigue a great deal. Look for mats that are easy to clean as well as offering some cushion. Your milk inspector might be able to offer suggestions so what you install will meet their expectations for sanitation as well.
The milking staff is an extremely important cog in your dairy business. They are the ones harvesting your crop two or three times every day. You wouldn't dream of putting an untrained, ill-prepared and ill-equipped person up in your $400,000 combine for a few days in the fall. Why would you want to do any less for those people who perform a similar harvest task for you every day of the year?
Milk a bit smarter. Set up your parlor for milker safety and comfort and you will have more productive and healthier employees.