Rejuvalex very hard to duplicate that with you know just the efficiency of being able to do that whether the device is there so I mean I mean a Manman your thing that's a subject think I can I can talk about all day and it's a you know I would say that the disadvantages to manual training is I guess a lack of precision in the amount of tension you're using but I think you know you can make up for that by taking things a little more slowly…