I have a number of clients who are in a tennis league&/or belong to a club and are there something to the tune of 3 times a week, minimum.
It does seem to be one of the places this type of client hangs out.
I'd also suggest you get to know the area "quilting shops". This may sound hokey, but quilting is not what it used to be. A yard of the "right" first batch fabric (which is mainly what these stores sell) is not cheap; Avg = $9.25 per yard... and it takes a lot of yards to make just the "top" of the quilt, add in the batting, thread, backing, and whatever other stuff you need to do a project like this and you can see it gets to be an expensive hobby. Most quilters aren't getting their fabric at Wal-Mart or from other less expensive alternatives any more.
And one of my clients who is very fit, and belongs to a tennis club... is a known quilter, so that's part of the reason why I am adding it here.
Here's a list of quilting shops that may be in your region (I just googled "quilting St. Paul, MN" ---- and it looked like there were a lot more):
Crossroads Shoppe
619 Grand Ave, St Paul, MN
(651) 225-4467
Quilted Shingle
7250 Hudson Blvd N # 120, St Paul, MN
(651) 731-4700
Quilted Shingle
7166 10th St N, Saint Paul, MN
(651) 731-4700
Quilt Cove
1960 Cliff Lake Rd # 134, Eagan, MN
(651) 452-8891
Quilter's Haven
14680 S Robert TRL, Rosemount, MN
(651) 322-7071
Bear Patch Quilting Co
2199 4th St, White Bear Lake, MN
(651) 429-1039
Bear Patch Quilting
2202 5th St, St Paul, MN
(651) 429-6500
Rosebud's Coteforum.xxxe
2580 7th Ave E, St Paul, MN
(651) 426-1885
Quilters Courtyard
2112 Ford Pkwy # B, St Paul, MN
(651) 698-1816
Colorful Quilts & Textiles
2233 Energy Park Dr # 400, St Paul, MN
(651) 628-9664
Treadle Yard Goods
1338 Grand Ave, St Paul, MN
(651) 698-9690
Artful Imaging By Spirit
2100 Snelling Ave N, St Paul, MN
(651) 631-3736
Moose Country Quilting
957 County Road B W, St Paul, MN
(651) 646-5218
Patti's Machine Quilting
2576 7th Ave E, St Paul, MN
(651) 779-7142
North Star Quilting
304 Sherburne St N, Stillwater, MN
(651) 430-1077
Fabric Town
7655 148th St W, Apple Valley, MN
(952) 432-1827
Bonnie's Custom Quilting
1297 Burns Ave, St Paul, MN
(651) 778-1702
Quaker Quality Quilting
850 Wagon Wheel Trl, Mendota Heights, MN
(651) 686-7361
The Traveling Quilter: Quilt Stores in Minnesota
http://planetpatchwork.com/travel/minnesota.htm
Maybe you could give them a % off their first visit with you, or something?