Keep the shutter on 50/sec, use an ND filter (either circular screw-on type or 4×4 with Mattebox), stabilize by developing rigid arm locks and being light on your feet, while hold. Also by using a tripod, cushion (if you are on the ground shooting low & upwards), monopod, gorillapod, or table/solid surface. Worst case fix in post ????
Have fun!