Most of the Lazy Portfolios have a very simple asset allocation.
They can be implemented with few ETFs, so it's very easy to build them.
In order to have always a consistent maximum level of risk, Lazy Portfolios require a rebalancing.
Rebalancing a portfolio means reporting the asset allocation to the original percentage composition.
In other words, the only action requested from the investors it to rebalance a Lazy Portfolio, usually once every year.