Would this be too much exercise?

Thank you all for your really helpful replies. Especially regarding lifting for different areas on different days (arms one day legs the next).

Re: doing HIIT and lifting on different days, unfortunately this isn't an option for me. I have found that I am still improving with weights even when I do them after HIIT, as I am still managing to increase the amount of weight over time so I am definitely getting stronger.

You may well be getting stronger and I applaud your effort but you should still consider splitting the days. HIIT and Strength Training both affect the central nervous system and there should be some recovery between. You will get full benefit from both by splitting them. I see you say you can't and there may be some limitation causing this but it would be best if you could.

Only because I just don't think a weight session by itself will be much of a workout. My gym is a council owned/local authority one and the weights are very limited. The only free weights they have are dumbells. I use the weight machines such as lat pulldowns, leg curls/extention/press, chest press, adominal crunches....usually 4 sets of each x 8 reps. I just don't see how that by itself will benefit me more than doing it in a session with a bit of cardio. I am a bit thick though, so if you/someone could explain!!

because if you do both, it means you are not pushing yourself enough
HIIT is extreme exercise that should make you dead tired.
You should perform high intervals at 90% of what your heart can do, anything less is just regular interval training, not HIIT.
As for lifting, I use dumbbels only, but dumbbells in my gym go up to 30 kg (>60lbs) so it's pretty intense, I do full body rutine, 5 exercises, compund moves.

I would say that if you are trying to make best possible progress you need to rearrange your rutine, changing both HIIT and lifting to more challenging. Then you will understand that only lifting or only HIIT can be enough.

Erm, no....not every day for the rest of my life. Nor do I ever intend on having 1 kid, let alone 10.

Anyone else?

Then yes it is too much exercise. Unless you're training for a sport specific event there's no need to work of twice a day. It overtaxed your body.

The kids example was just that an example. There are thousands of other ones I could have used. If you can't see yourself keeping up wih something long term then it's too muh for weight loss and/or fitness.

they way you do it is sabotaginng improvements in both HIIT and lifting

I would recomend you not to mix HIIT with lifting

better do lifting 3 times a week, and HIIT other 3 days a week
take 1 rest day a week (you can walk maybe swim or bike but on slow pace)

HIIT should be so intense that after you cannot perform lifting, if you can you are not pushing yourself enough.

This is what I do:
lots of walking (every day about 1h, I simply walk everywhere)
lifting 3 times a week
HIIT 2 times a week (I would do 3, but I'm too lazy...)
if I want to burn more calories, after HIIT 5 minutes cool down and then bike or some interval jog/walk (jog 5mph) - I couldn't go any faster, 20 minute HIIT really takes all my energy.

Also if you want to burn more calories instead of 20 min HIIT you can go for 40 min interval training, not as intense as HIIT but as you can perform it longer, you will burn more. After lifting you could also perform aditional interval training, but only if you stop doing HIIT every other day.

so you can do this:

lifting 3 x week (for example monday, wed, fri), HIIT + low/medium intensity cardio 3x week (tue, thu, sat), rest day sunday
or
Lifting and intervals after lifting 3x per week (for example monday, wed, fri), resting other days

and ad some low intensity cardio (walking, swimming, leasure biking) on the top of that