Hi, Mellow
You can certainly do HIIT at home, no equipment required.
Level 1 Shred is free on YouTube. You can use tins or plastic bottles for weights
OR
Do your own exercises with just bodyweight:
Download a free timer App to set your interval timings.
You do need a sports bra, plus loose T-shirt, shorts / jeggings, trainers
Ideally, get a skipping rope too, very cheap and great exercise
HIIT Exercises:
Rope-skipping, burpees, jumping jacks, spotty dog, punching air, step-ups, squats, lunges, pressups, tricep dips on a step, situps, plank, side plank with hip raises, leg raises ...
or do different exercises for each interval.
If you can get outside, do sprinting intervals, with jogging for recovery. Or if you are less fit, do walking intervals - brisk / normal pace.
Anyone is welcome to join us on the IF / 5:2 Exercise Thread #3 for support and advice.
info, videos and exercise descriptions in the OP there.