Strength training in pool?

Any suggestions for exercise in pool? I have a pool and it's too hot to hike so 2 weeks ago I did 10 laps and after the first 3 I thought I could sink or have a heart attack at any time so had hubby watch me.

Now I am doing 40 laps play with kids for a bit pass etc and I do another 40 with lest effort then the first 10.

What can I do in my backyard pool? Should I focus on faster laps or more? I will hold a floating football in my hand hoping to tone my arms? Long way to go..

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