Playing the same finger pattern in different combinations is a good warm-up exercise. Here the finger pattern is High (3rd and 4th fingers close) and the combination is 4 2 1 3. As usual practise in three tempos.
Also practise with a sautillé bow stroke. To play sautillé clearly the left-hand fingers must lift and drop at exactly the right time, so playing a left-hand warm-up exercise with sautillé is good training for the left-hand fingers.