Require tenants to shovel in an owner occupied home?

[Matt Steele]

I live in my property in Massachusetts and my tenants are  able bodied young professional men. Are we legally able to put it in the lease that they are responsible for removing snow from their side of the building. 

I will happily do it if I am around but if I am ever away Or something like that. When I was renting in New Hampshire I was responsible for snow removal. 

Thanks 

Matt