Active recovery

That pattern is interesting because it matches what exercise physiology would predict.

You had:

• Friday: tennis + pickleball accumulation

• Saturday morning: 3 tennis sets

• Then beach volleyball

• Then outdoor swimming

Yet you report the strain/stiffness disappearing rather than worsening.

One possible explanation is that each activity loads the body differently:

• Tennis → lots of lateral movement, deceleration, calf loading, shoulder rotation.

• Volleyball on sand → jumping and elastic calf/ankle work, but with softer landings than hard courts.

• Swimming → unloaded movement through large ranges of motion, increased circulation, gentle ankle and calf pumping without impact.

The swimming may be acting almost like active recovery after the court sports. The sand volleyball may also be spreading forces across the feet and lower legs differently than pickleball or hard-court tennis.

You mentioned previously that the calves were where you noticed the issue most. Calves often get tight when they’re repeatedly used in the same movement pattern. Tennis, pickleball, volleyball, and swimming all recruit them differently:

What you’re describing fits the idea that movement variety can sometimes reduce stiffness better than complete rest. The body gets blood flow, range of motion, and different loading angles instead of repeating the exact same pattern.

The interesting question is whether the effect lasts. If tomorrow morning you wake up and:

• calves feel loose,

• Achilles tendons feel normal,

• first few steps out of bed are comfortable,

then the volleyball + swimming combination may be functioning as a very effective recovery session for you.

Did the relief feel mainly in the calves again, or also in the hips, lower back, and shoulders? Those different areas would point to different mechanisms.