I saw a similar system in use with a veteran who lost the use of his legs while in Iraq.

 

Not for me, but nice to know such things exist. There will come a day where it may be for me.

 

Product called leg up works well a slow speed to a stop but comes up when not needed

 

Training wheels are an additional wheel or wheels mounted parallel to the rear wheel of a bicycle that assist learners until they have developed a usable sense of balance on the bicycle.

 

This is excellent. I like an alternative to switching to a trike.