In most cases, gentle recovery exercises like walking or swimming are safe if you're sore after working out. They may even be beneficial and help you recover.
If you have three to four hours before your workout, go ahead and have a standard meal consisting of carbs, proteins, and fats. If you have one to two hours.
So - what is the recommended number of HIIT sessions per week? Guidelines suggest no more than 30-40 minutes of training with your heart rate above 90% per week.