Complex sentence: The up phase of the burpee used to be with the feet landing between the hands while still grounded, which creates unnecessary pressure on the lower-back, it's now more common to land the feet on the outside of the hands.
Split into simpler sentences: The up phase of the burpee used to be with the feet landing between the hands while still grounded, which creates unnecessary pressure on the lower-back. It's now more common to land the feet on the outside of the hands.