After being diagnosed with autoimmune arthritis, Tina Breslin took an introspective look at her climbing. Drawn to beautiful places, and the quiet mindset she finds, she began seeking out increasingly difficult - and tall - highball boulders

Highballing is the grey zone between free soloing and bouldering: climbing ropeless above crashpads, but beyond the height where you can be sure they'll protect you.

The gritstone edges of the Pennines lend themselves to this style of climbing, though their widely spaced features rarely make ascent easy. At 5'2 Tina is often the first woman, or shortest person, to climb these proud lines.

Fierce is an intimate portrait of Tina. A film about grit.