Display all frame variables for every step in lldb

How to display all frame variables for every step in lldb?

For example, I have a routine in C

int
print_all_variables(int a, int b)
{
    int x = 10, i;
    for (i = 0; i < 10; i++) {
        x = a + b + x;
        b++;
        x++;
    }
    return x;
}

I would want to display, values of all the variables in print_all_variables() routine above for every step while debugging using lldb