How do you get the poster to not roll up? It’s been in the tube so long that it doesn’t want to lay flat. I have damaged and trying to open it up

ASIN	B07VYNMYRJ
Age Range Description	Adult
Best Sellers Rank	#242,293 in Sports, Fitness & Outdoors ( See Top 100 in Sports, Fitness & Outdoors ) #45 in Fitness Wall Charts
Brand Name	VIVE
Color Family	Clear
Colour	Multicolor
Country of Origin	USA
Cover Material	Paper
Customer Package Type	Standard Packaging
Customer Reviews	4.4 out of 5 stars 878 Reviews
Finish Type	Laminated
Frame Type	Unframed
Global Trade Identification Number	00818323028584
Included Components	60 day guarantee
Indoor Outdoor Usage	Indoor
Is Framed	No
Is Original Artwork	No
Item Dimensions L x W	76.2L x 43.2W Centimeters
Item Shape	Rectangular
Item Type Name	fitness
Item Weight	0.18 Kilograms
Manufacturer	Vive Health
Material Type	Paper
Mounting Type	Wall Mount
Number of Items	1
Orientation	Landscape
Paint Type	Watercolor
Paper Finish	Matte
Pattern	Printed
Product Style	Dumbbell
Recommended Uses For Product	home gym decor or workout space enhancement
Room Type	Living Room
Size	76.2L x 43.2W cm
Theme	Abstract
UPC	818323028584
Unit Count	1.0 Count
Wall Art Form	Poster

Vive Dumbbell Exercise Poster - Home Gym Workout for Upper, Lower, Full Body - Laminated Bodyweight Chart for Back, Arm, Core and Legs - Free Weight Building Guide for Men, Women, Elderly (30" x 17")