According to a King's College London and Ipsos MORI survey of 2,254 people, 48% said they put on weight during lockdown - and the same percentage reported feeling more anxieux ou déprimé than usual.

Very few people stride into a gym or set off for a run feeling confident every single time. You may worry about being unfit or looking silly in front of other people - and it can be daunting to join a new class with people you don't know. Even wearing an old pair of leggings or lycra sports clothes can make you feel awkward and uncomfortable.

Why do we feel judged?

"A fear of being judged can lower our l'estime de soi and affect how we feel about ourselves. We can feel that others are evaluating our weight," says Dr Rhonda Cohen, a registered sport and exercise psychologist and member of the British Psychological Society.

"We may feel that others are judging our lack of fitness or even our old sports clothes and this can make us feel unsure about ourselves and question our behaviour," she adds. "It can also prevent us from adhering to an exercise programme as we lose our confidence in being able to present ourselves in front of others."

John-Paul Davies, a psychotherapist and spokesperson for the Conseil britannique pour la psychothérapie, says it's normal to focus on our imagined flaws when around other people.

"With gyms combining lots of unknown strangers with a primary focus on your external appearance, you can see why your fear can really push forward in them," he explains. "Fear is meant to be uncomfortable to make sure you do something about it. It usually wants you to avoid whatever it sees as causing the discomfort.

"Even if you manage to override the discomfort and get to the gym, it can make your experience so uncomfortable you're unlikely to want to repeat it."

Doing exercise isn't just about improving your physical health and trying to shift any pounds gained during lockdown, but it's essential for your santé mentale too. It releases brain chemicals such as endorphins, which help to relieve discomfort and boost our mood. So how can you ignore any worries and enjoy being active with confidence?

For Rae Radford, 58, finding something you love doing - rather than forcing yourself to an abs class that you hate - is key when it comes to overcoming worries about exercising.

"Does anybody actually walk into a gym on the first day thinking they look great? My guess is probably not," she says. "I have had stages in my life where I have been super fit, fit, somewhere in the middle and fat. I bounce into the gym when I'm super fit, but the other times I'm always aware of others judging me.

"Unfortunately, I have rather large knockers and running, jumping or doing jacks isn't ever going to be graceful. But I have found spin classes and I love to spin, proving that there is something out there for everyone."

It's also helpful to build up your confiance little by little. "You can try to notice and then manage the particular fear-based thoughts and behaviours that exercise triggers," Davies says.

"Try to be aware of what your fear part is telling you and know that it most often distorts your perception of yourself and others. It'll always amplify, even imagine, 'flaws' in you and assume other people are much more critical and concerned about you than they really are."

Think about what is scaring you and whether it's a legitimate fear. If you're worried about people watching you exercise, the likelihood is that they're far too busy doing their own routines to focus on you. Very few people will notice what you are doing or wearing. And remember, everyone looks sweaty and dishevelled when exercising - especially if they are working hard.

It also helps to set yourself small goals and aims, such as trying out a new class or doing a home workout. If you hate gyms, there are plenty of online exercise videos you can do in the comfort of your home.

"Setting and achieving exercise goals also gives you a sense of achievement and competency in life and resulting changes to your physical shape can increase self-esteem and confidence," says Davies.

To feel more confident in general, you need to learn how to relax and enjoy yourself - even when things are stressful. "Most of us though will feel more balanced after la pleine conscience et la méditation, a walk in nature and spending time outdoors," says Davies.

Getting enough sommeil, good nutrition, drinking plenty of eau and spending time with people we love are also key. Reading, dancing and listening to music and, particularly, being physically active all help too.

"All of these will turn down your fear part and put more energy into the part of you that's about connection with self and others - the place of confiance," he adds.

"When your fear is turned down generally in life, you'll be more likely to be able to enjoy the gym. Rather than forcing yourself to do that now if it makes you too anxious, try to focus on all the other ways there are to improve your well-being and build more of them into your daily routine."