Starting from Bormio, you can easily reach Tirano.
From there, the climb immediately begins to be very demanding, until you reach the lake of Poschiavo, after 17 km.< /p>
Here you can catch your breath for a moment. Then the climb doesn't let you breathe until the Bernina pass.
The climb is very demanding and very long. Also beware of the always very heavy vehicular traffic.
To return to Bormio, pass through the Passo della Forcola and go down to Livigno. Then the Foscagno pass is the last roughness of a truly beautiful, but also very demanding route.