A personal trainer says training for tennis is an efficient way to build a good physique. Here's how to do it.
Workouts to boost performance on the court move the body in all directions, which also creates a balanced physique, Luke Worthington told Insider.
I was diagnosed with ADHD in my 20s. I used my condition to train for a 10K race in 10 weeks.
The author says that after her gym closed, she turned to running. She says she tricked her brain into hyperfocusing on running and ran a 10K.
The World's Strongest Man only did 3 moves for 2 months when he started lifting. He says it built the foundation for his record-breaking strength.
Tom Stoltman, who is 6'8" and weighs around 397 pounds, holds the record for lifting the heaviest Atlas Stone, which weighed 630 pounds.
I'm considering quitting the gym to save money. What should I look for in an online fitness program or coach for home workouts?
Look for a qualified coach and a workout program that has progression, different difficulty levels, and a community, personal trainer Tom Lowe said.
What US Navy recruits go through in their 10-week boot camp
We got an inside look at the United States Navy's 10-week basic training program in Great Lakes, Illinois.
Alexander Skarsgård gained 20 pounds of muscle to sculpt a thick viking look for his role in 'The Northman,' his trainer said. Here's how he did it.
Skarsgård's trainer, Magnus Lygdbäck, said he lifted heavy and light weights and ate lots of protein so he'd "look like a bear but move like a wolf."
A 2-time Olympic medalist extended his snowboarding career when he shifted his mindset at 19 years old
"I want to do this as long as I can at the highest level I possibly can," Australian star Scotty James told Insider. " So that is my driving factor."
I scaled London's highest glass climbing wall overlooking the city, and the breathtaking views inspired me to take my workouts to the next level
BXR City is a new luxury gym in London that costs members over $3,000 a year. The equipment is high-end, and the views are spectacular.
Chris Hemsworth didn't box as a teen to protect his 'pretty face,' his trainer says. Now he regularly spars with a UFC coach.
Hemsworth is now an avid boxer, but he protects his face by wearing a mouthguard at all times and only takes body shots, trainer Luke Zocchi said.
What Army soldiers go through on their first day of basic training
We got an inside look at what United States Army infantry trainees go through during their first day of basic training in Fort Benning, Georgia.
NFL star Travis Kelce runs on an underwater treadmill to build endurance and prevent injuries
Kansas City Chiefs star tight end Travis Kelce put together another solid season at 32. He credits his underwater treadmilling for recovery.
An Olympic gold-medal favorite sticks to her strict pre-event routines because 'you can't cram for the exam'
American speed skating superstar Erin Jackson told Insider that her "plan at the Olympics is to treat it like every other race as much as I can."
Hostages who escaped Texas synagogue say lessons in security training helped save their lives
Hostages said they knew to shield their bodies and position themselves near exits because of training from groups like the Anti-Defamation League.
10 weightlifting mistakes that are stalling your gains and how to fix them, according to experts
Whether you're a newbie or advanced weightlifter, you can build more muscle by avoiding common mistakes like overtraining and under eating.
How professional Santas are trained before the Christmas holiday season
Professional Santas from all around the world travel to the Charles W. Howard Santa Claus School to learn all things Santa before the holiday season.
Cardio or stretching isn't the best way to warm-up for a workout. Here's what you should do instead, according to a personal trainer.
"Movement prep," which can include exercises like deadbugs and glute bridges, better prepares your body for a workout, trainer Luke Worthington said.
3 shoulder exercises that make your arms look toned and your waist look smaller
Defined shoulders can make a person's arms look more toned and their waist look smaller. These are the best exercises to build them.
I followed Adele's punishing workout schedule for a day. I couldn't maintain it if I wanted a social life or to keep my job.
Insider's fitness reporter Rachel Hosie did weights in the morning, hiking and boxing in the afternoon, and cardio in the evening to train like Adele.
One of the NFL's best blockers says his game transformed after he started doing squats on a physio ball — here's how it works
New York Giants offense tackle Andrew Thomas took up balance training this offseason, and it's made a huge difference in his strength and agility.
A personal trainer who has rippling 6-pack abs because of a hidden medical condition says he’s proof that being lean doesn’t mean you’re healthy
Personal trainer Ben Carpenter said he's never had to work on his abs due to his low body fat levels that are a result of Crohn's disease and IBS.