He's the personal trainer who has helped the likes of Adele, Naomi Campbell and Ellie Goulding. 

But now Matt Roberts wants to assist you. 

The celebrity PT is sharing his abs workout that could give you a chiseled stomach and hulk-like core.  

All three of his exercises are jazzed up versions of the 'plank' — the same dull move that bores gym-goers across the planet.

But Mr Roberts says these challenging plank variations are his 'go-to' moves for a strong core. 

One will make you shake as it tones your shoulders and obliques, another will put your balance and upper body strength to the test, while the third will give you that core you've always desired.

Simply grab a mat, and a stability ball if you have one, and follow these three steps. 

The side plank is a killer core exercise move. 

It helps tone your shoulders, obliques (the sides of you abs), legs from heel to hip and strengthen your back.

How to do it 

Laying on your side, place your top foot ahead of the bottom one and raise your body off the ground with your weight on one elbow. 

Keep your pelvis facing forwards at all times. 

From here, you can either hold on this position for 30-60 seconds or raise your body laterally up and down, dropping your hip towards the floor each time. 

Make sure you tense your obliques in each lift and pull your stomach inwards. 

You can complete this move for 30-60 seconds on each side holding the side plank. 

Alternatively, do 15-30 seconds of hip raises on each side and repeat it for 3-5 sets. 

Not only is this move great at toning your abs and upper body, it also strengthens your spine. 

The extended ball plank will also test your balance as you move along the stability ball. 

How to do it 

This move is best completed using a stability ball, if you have one. 

Using the ball, get into a plank position with your elbows and forearms on the ball and your feet on the ground. 

Make sure you keep your feet shoulder distance apart.

Now, push/roll the ball away from you by extending your arms forward at the shoulder. 

While you do this keep your stomach pulled inwards. 

Reach forward until you feel increased work on the stomach and then return to the start position before repeating.

You can do this exercise for 10-20 reps, then repeated for 3-5 sets.

If you do not have a stability ball to hand, you can do this same exercise by sliding on a towel on a wood or ceramic floor, according to Mr Roberts. 

But he warns that it's much harder than using a ball. 

The plank and reach is another great plank variation that will tone your abs. 

It will help build strength in your abdominals and your back muscles.  

How to do it 

Get into the plank position again. 

For this move, keep your pelvic still and your body straight as you raise one arm and reach forwards ahead of you. 

Try not to rotate the pelvis or raise the butt. 

Performing this in an alternating pattern for 20-40 reps.

Then repeat each set 3-5 times. 

To stay healthy, adults aged 19 to 64 should try to be active daily and should do:

Or:

Or:

A good rule is that 1 minute of vigorous activity provides the same health benefits as 2 minutes of moderate activity.

One way to do your recommended 150 minutes of weekly physical activity is to do 30 minutes on 5 days every week.

All adults should also break up long periods of sitting with light activity.

Source: NHS